diff --git a/README.md b/README.md
index d59df835..cfbb0453 100644
--- a/README.md
+++ b/README.md
@@ -34,6 +34,7 @@ This project is **not affiliated with Xteink**; it's built as a community projec
   - [ ] EPUB picker with cover art
 - [x] Custom sleep screen
   - [x] Cover sleep screen
+- [x] Calendar Mode (automated image display from URL)
 - [x] Wifi book upload
 - [x] Wifi OTA updates
 - [x] Configurable font, layout, and display options
@@ -43,6 +44,61 @@ This project is **not affiliated with Xteink**; it's built as a community projec
 
 See [the user guide](./USER_GUIDE.md) for instructions on operating CrossPoint.
 
+## Calendar Mode
+
+Calendar Mode transforms your CrossPoint Reader into an automated display that periodically fetches and displays a BMP image from a URL. This is useful for:
+
+- Calendar/schedule displays
+- Weather dashboards
+- Information displays
+- Digital signage
+
+### How It Works
+
+1. When enabled, the device wakes from deep sleep on a timer (1-24 hours configurable)
+2. Connects to saved WiFi network
+3. Fetches a BMP image from the configured URL
+4. Displays the image as the sleep screen
+5. Returns to deep sleep until the next refresh
+
+### Configuration
+
+In **Settings**, you'll find:
+
+| Setting | Description |
+|---------|-------------|
+| **Calendar Mode** | Enable/disable the feature (ON/OFF) |
+| **Calendar Refresh (hours)** | How often to refresh (1-24 hours) |
+| **Calendar Server URL** | URL that returns a BMP image |
+| **Test Calendar Now** | Immediately test the fetch and display |
+
+### Image Requirements
+
+The server URL must return a valid BMP image:
+
+- **Format**: BMP (Windows bitmap)
+- **Bit depth**: 1, 2, 8, 24, or 32 bpp (8-bit grayscale recommended)
+- **Dimensions**: 480 x 800 pixels (device screen size)
+- **Orientation**: Top-down (negative height in BMP header) recommended
+
+### Setting Up a Server
+
+You'll need a server that generates and serves BMP images. Example options:
+
+- **Cloudflare Worker**: Serverless function that generates images on-demand
+- **Local server**: Python/Node.js script serving static or dynamic images
+- **Static hosting**: Pre-generated images on any web server
+
+The device makes a simple HTTP GET request to the URL and expects raw BMP data in response.
+
+### Power Consumption
+
+Calendar Mode uses ESP32-C3 deep sleep between refreshes:
+- Deep sleep: ~10-20µA
+- Active (WiFi + fetch): ~100-150mA for ~10-30 seconds
+
+With a 4-hour refresh interval, expect several months of battery life.
+
 ## Installing
 
 ### Web (latest firmware)
diff --git a/src/CrossPointSettings.cpp b/src/CrossPointSettings.cpp
index 17b5d053..9433333c 100644
--- a/src/CrossPointSettings.cpp
+++ b/src/CrossPointSettings.cpp
@@ -12,9 +12,9 @@
 CrossPointSettings CrossPointSettings::instance;
 
 namespace {
-constexpr uint8_t SETTINGS_FILE_VERSION = 1;
+constexpr uint8_t SETTINGS_FILE_VERSION = 2;  // Incremented for calendar mode
 // Increment this when adding new persisted settings fields
-constexpr uint8_t SETTINGS_COUNT = 18;
+constexpr uint8_t SETTINGS_COUNT = 21;  // Added 3 calendar settings
 constexpr char SETTINGS_FILE[] = "/.crosspoint/settings.bin";
 }  // namespace
 
@@ -48,6 +48,10 @@ bool CrossPointSettings::saveToFile() const {
   serialization::writePod(outputFile, textAntiAliasing);
   serialization::writePod(outputFile, hideBatteryPercentage);
   serialization::writePod(outputFile, longPressChapterSkip);
+  // Calendar mode settings
+  serialization::writePod(outputFile, calendarModeEnabled);
+  serialization::writePod(outputFile, calendarRefreshHours);
+  serialization::writeString(outputFile, std::string(calendarServerUrl));
   outputFile.close();
 
   Serial.printf("[%lu] [CPS] Settings saved to file\n", millis());
@@ -116,6 +120,18 @@ bool CrossPointSettings::loadFromFile() {
     if (++settingsRead >= fileSettingsCount) break;
     serialization::readPod(inputFile, longPressChapterSkip);
     if (++settingsRead >= fileSettingsCount) break;
+    // Calendar mode settings
+    serialization::readPod(inputFile, calendarModeEnabled);
+    if (++settingsRead >= fileSettingsCount) break;
+    serialization::readPod(inputFile, calendarRefreshHours);
+    if (++settingsRead >= fileSettingsCount) break;
+    {
+      std::string urlStr;
+      serialization::readString(inputFile, urlStr);
+      strncpy(calendarServerUrl, urlStr.c_str(), sizeof(calendarServerUrl) - 1);
+      calendarServerUrl[sizeof(calendarServerUrl) - 1] = '\0';
+    }
+    if (++settingsRead >= fileSettingsCount) break;
   } while (false);
 
   inputFile.close();
diff --git a/src/CrossPointSettings.h b/src/CrossPointSettings.h
index a5641aad..3fc46607 100644
--- a/src/CrossPointSettings.h
+++ b/src/CrossPointSettings.h
@@ -93,6 +93,11 @@ class CrossPointSettings {
   // Long-press chapter skip on side buttons
   uint8_t longPressChapterSkip = 1;
 
+  // Calendar mode settings
+  uint8_t calendarModeEnabled = 0;   // 0 = disabled, 1 = enabled
+  uint8_t calendarRefreshHours = 4;  // Refresh interval in hours (1-24)
+  char calendarServerUrl[256] = "";  // URL to fetch BMP image from
+
   ~CrossPointSettings() = default;
 
   // Get singleton instance
diff --git a/src/activities/calendar/CalendarActivity.cpp b/src/activities/calendar/CalendarActivity.cpp
new file mode 100644
index 00000000..46504b2b
--- /dev/null
+++ b/src/activities/calendar/CalendarActivity.cpp
@@ -0,0 +1,251 @@
+#include "CalendarActivity.h"
+
+#include <GfxRenderer.h>
+#include <HTTPClient.h>
+#include <SDCardManager.h>
+#include <WiFi.h>
+#include <esp_sleep.h>
+
+#include "../../CrossPointSettings.h"
+#include "../../WifiCredentialStore.h"
+#include "../../fontIds.h"
+#include "../boot_sleep/SleepActivity.h"
+
+// External functions from main.cpp
+extern void exitActivity();
+extern void enterNewActivity(Activity* activity);
+extern void enterDeepSleep();
+
+void CalendarActivity::onEnter() {
+  Activity::onEnter();
+  state = CalendarState::INIT;
+  stateStartTime = millis();
+
+  Serial.printf("[%lu] [CAL] Calendar mode starting\n", millis());
+  renderStatus("Starting...");
+
+  // Begin WiFi connection
+  startWifiConnection();
+}
+
+void CalendarActivity::startWifiConnection() {
+  Serial.printf("[%lu] [CAL] Loading WiFi credentials\n", millis());
+
+  // Load saved credentials
+  WIFI_STORE.loadFromFile();
+
+  const auto& credentials = WIFI_STORE.getCredentials();
+  if (credentials.empty()) {
+    handleError("No saved WiFi");
+    return;
+  }
+
+  // Use first saved network
+  const auto& cred = credentials[0];
+  Serial.printf("[%lu] [CAL] Connecting to: %s\n", millis(), cred.ssid.c_str());
+
+  char statusMsg[64];
+  snprintf(statusMsg, sizeof(statusMsg), "Connecting to %s...", cred.ssid.c_str());
+  renderStatus(statusMsg);
+
+  WiFi.mode(WIFI_STA);
+  WiFi.begin(cred.ssid.c_str(), cred.password.c_str());
+
+  state = CalendarState::CONNECTING_WIFI;
+  stateStartTime = millis();
+}
+
+bool CalendarActivity::checkWifiConnection() { return WiFi.status() == WL_CONNECTED; }
+
+bool CalendarActivity::fetchAndSaveImage() {
+  Serial.printf("[%lu] [CAL] Fetching image from: %s\n", millis(), SETTINGS.calendarServerUrl);
+
+  // Check if URL is set
+  if (strlen(SETTINGS.calendarServerUrl) == 0) {
+    Serial.printf("[%lu] [CAL] ERROR: Calendar Server URL is empty!\n", millis());
+    return false;
+  }
+
+  HTTPClient http;
+  http.begin(SETTINGS.calendarServerUrl);
+  http.setTimeout(30000);
+  http.setConnectTimeout(10000);
+
+  int httpCode = http.GET();
+
+  if (httpCode != HTTP_CODE_OK) {
+    Serial.printf("[%lu] [CAL] HTTP error: %d\n", millis(), httpCode);
+    http.end();
+    return false;
+  }
+
+  int contentLength = http.getSize();
+  Serial.printf("[%lu] [CAL] Content length: %d bytes\n", millis(), contentLength);
+
+  // Open file for writing using SdMan
+  FsFile file;
+  if (!SdMan.openFileForWrite("CAL", "/sleep.bmp", file)) {
+    Serial.printf("[%lu] [CAL] Failed to open /sleep.bmp for writing\n", millis());
+    http.end();
+    return false;
+  }
+
+  // Stream response to file
+  WiFiClient* stream = http.getStreamPtr();
+  uint8_t buffer[512];
+  int totalWritten = 0;
+
+  while (http.connected() && (contentLength > 0 || contentLength == -1)) {
+    size_t available = stream->available();
+    if (available) {
+      size_t toRead = min(available, sizeof(buffer));
+      size_t bytesRead = stream->readBytes(buffer, toRead);
+
+      if (bytesRead > 0) {
+        file.write(buffer, bytesRead);
+        totalWritten += bytesRead;
+
+        if (contentLength > 0) {
+          contentLength -= bytesRead;
+        }
+      }
+    } else {
+      delay(10);
+    }
+
+    // Check for timeout
+    if (millis() - stateStartTime > HTTP_TIMEOUT_MS) {
+      Serial.printf("[%lu] [CAL] HTTP timeout during download\n", millis());
+      file.close();
+      http.end();
+      return false;
+    }
+
+    // Break if we've received everything
+    if (contentLength == 0) {
+      break;
+    }
+  }
+
+  file.close();
+  http.end();
+
+  Serial.printf("[%lu] [CAL] Saved %d bytes to /sleep.bmp\n", millis(), totalWritten);
+  return totalWritten > 0;
+}
+
+void CalendarActivity::renderSleepScreen() {
+  Serial.printf("[%lu] [CAL] Rendering sleep screen\n", millis());
+
+  // Force sleep screen mode to CUSTOM to use our downloaded image
+  SETTINGS.sleepScreen = CrossPointSettings::CUSTOM;
+
+  // Create and enter SleepActivity to render the image
+  exitActivity();
+  enterNewActivity(new SleepActivity(renderer, mappedInput));
+}
+
+void CalendarActivity::scheduleWakeAndSleep() {
+  Serial.printf("[%lu] [CAL] Scheduling wake in %d hours\n", millis(), SETTINGS.calendarRefreshHours);
+
+  // Disconnect WiFi to save power
+  WiFi.disconnect(true);
+  WiFi.mode(WIFI_OFF);
+
+  // Calculate sleep duration in microseconds
+  uint64_t sleepDurationUs = (uint64_t)SETTINGS.calendarRefreshHours * 60ULL * 60ULL * 1000000ULL;
+
+  Serial.printf("[%lu] [CAL] Sleep duration: %llu us (%d hours)\n", millis(), sleepDurationUs,
+                SETTINGS.calendarRefreshHours);
+
+  // Enable timer wakeup
+  esp_sleep_enable_timer_wakeup(sleepDurationUs);
+
+  // Also keep GPIO wakeup for power button (allows manual wake for normal use)
+  esp_deep_sleep_enable_gpio_wakeup(1ULL << 3, ESP_GPIO_WAKEUP_GPIO_LOW);  // Power button pin
+
+  Serial.printf("[%lu] [CAL] Entering deep sleep\n", millis());
+
+  // Enter deep sleep
+  esp_deep_sleep_start();
+}
+
+void CalendarActivity::handleError(const char* message) {
+  Serial.printf("[%lu] [CAL] Error: %s\n", millis(), message);
+  errorMessage = message;
+  state = CalendarState::ERROR;
+  stateStartTime = millis();
+
+  // Show error on screen
+  char errorMsg[128];
+  snprintf(errorMsg, sizeof(errorMsg), "Error: %s", message);
+  renderStatus(errorMsg);
+}
+
+void CalendarActivity::renderStatus(const char* status) {
+  Serial.printf("[%lu] [CAL] Status: %s\n", millis(), status);
+
+  // Show status on screen
+  renderer.clearScreen();
+  renderer.drawCenteredText(UI_12_FONT_ID, 50, "Calendar Mode", true, EpdFontFamily::BOLD);
+  renderer.drawCenteredText(UI_10_FONT_ID, 100, status, true);
+  renderer.displayBuffer();
+}
+
+void CalendarActivity::loop() {
+  switch (state) {
+    case CalendarState::INIT:
+      // Should not reach here - onEnter handles init
+      break;
+
+    case CalendarState::CONNECTING_WIFI:
+      if (checkWifiConnection()) {
+        Serial.printf("[%lu] [CAL] WiFi connected, IP: %s\n", millis(), WiFi.localIP().toString().c_str());
+        renderStatus("WiFi connected, fetching...");
+        state = CalendarState::FETCHING_IMAGE;
+        stateStartTime = millis();
+      } else if (millis() - stateStartTime > WIFI_TIMEOUT_MS) {
+        handleError("WiFi timeout");
+      }
+      break;
+
+    case CalendarState::FETCHING_IMAGE:
+      if (fetchAndSaveImage()) {
+        Serial.printf("[%lu] [CAL] Image saved successfully\n", millis());
+        renderStatus("Image saved!");
+        state = CalendarState::RENDERING;
+      } else {
+        // Check if we have a cached image
+        if (SdMan.exists("/sleep.bmp")) {
+          Serial.printf("[%lu] [CAL] Fetch failed, using cached image\n", millis());
+          state = CalendarState::RENDERING;
+        } else {
+          handleError("Fetch failed");
+        }
+      }
+      break;
+
+    case CalendarState::RENDERING:
+      renderSleepScreen();
+      // After SleepActivity renders, we need to schedule sleep
+      state = CalendarState::SCHEDULING_SLEEP;
+      break;
+
+    case CalendarState::SCHEDULING_SLEEP:
+      scheduleWakeAndSleep();
+      // Should never reach here - device sleeps
+      break;
+
+    case CalendarState::ERROR:
+      // Wait 3 seconds showing error, then sleep anyway (use cached image if available)
+      if (millis() - stateStartTime > 3000) {
+        if (SdMan.exists("/sleep.bmp")) {
+          state = CalendarState::RENDERING;
+        } else {
+          // No cached image - just sleep with default screen and try again later
+          scheduleWakeAndSleep();
+        }
+      }
+      break;
+  }
+}
diff --git a/src/activities/calendar/CalendarActivity.h b/src/activities/calendar/CalendarActivity.h
new file mode 100644
index 00000000..4114207c
--- /dev/null
+++ b/src/activities/calendar/CalendarActivity.h
@@ -0,0 +1,49 @@
+#pragma once
+
+#include "../Activity.h"
+
+/**
+ * CalendarActivity - Automated calendar image fetch and display
+ *
+ * This activity is triggered on timer wake (not power button wake).
+ * It connects to WiFi, fetches a BMP image from a configured URL,
+ * saves it as the sleep screen, and returns to deep sleep.
+ *
+ * Flow:
+ * 1. Load saved WiFi credentials
+ * 2. Connect to WiFi (timeout: 30s)
+ * 3. HTTP GET image from configured URL (timeout: 60s)
+ * 4. Save image to /sleep.bmp on SD card
+ * 5. Render sleep screen
+ * 6. Schedule timer wake for next refresh
+ * 7. Enter deep sleep
+ */
+
+enum class CalendarState { INIT, CONNECTING_WIFI, FETCHING_IMAGE, SAVING_IMAGE, RENDERING, SCHEDULING_SLEEP, ERROR };
+
+class CalendarActivity final : public Activity {
+ public:
+  explicit CalendarActivity(GfxRenderer& renderer, MappedInputManager& mappedInput)
+      : Activity("Calendar", renderer, mappedInput) {}
+
+  void onEnter() override;
+  void loop() override;
+  bool preventAutoSleep() override { return true; }
+  bool skipLoopDelay() override { return true; }
+
+ private:
+  CalendarState state = CalendarState::INIT;
+  unsigned long stateStartTime = 0;
+  String errorMessage;
+
+  void startWifiConnection();
+  bool checkWifiConnection();
+  bool fetchAndSaveImage();
+  void renderSleepScreen();
+  void scheduleWakeAndSleep();
+  void handleError(const char* message);
+  void renderStatus(const char* status);
+
+  static constexpr unsigned long WIFI_TIMEOUT_MS = 30000;
+  static constexpr unsigned long HTTP_TIMEOUT_MS = 60000;
+};
diff --git a/src/activities/settings/SettingsActivity.cpp b/src/activities/settings/SettingsActivity.cpp
index efa0b9e1..cec7d892 100644
--- a/src/activities/settings/SettingsActivity.cpp
+++ b/src/activities/settings/SettingsActivity.cpp
@@ -9,14 +9,20 @@
 #include "CrossPointSettings.h"
 #include "MappedInputManager.h"
 #include "OtaUpdateActivity.h"
+#include "activities/calendar/CalendarActivity.h"
+#include "activities/util/KeyboardEntryActivity.h"
 #include "fontIds.h"
 
 // Define the static settings list
 namespace {
-constexpr int settingsCount = 20;
+constexpr int settingsCount = 24;
 const SettingInfo settingsList[settingsCount] = {
     // Should match with SLEEP_SCREEN_MODE
     SettingInfo::Enum("Sleep Screen", &CrossPointSettings::sleepScreen, {"Dark", "Light", "Custom", "Cover", "None"}),
+    // Calendar mode settings
+    SettingInfo::Toggle("Calendar Mode", &CrossPointSettings::calendarModeEnabled),
+    SettingInfo::Value("Calendar Refresh (hours)", &CrossPointSettings::calendarRefreshHours, {1, 24, 1}),
+    SettingInfo::Action("Calendar Server URL"), SettingInfo::Action("Test Calendar Now"),
     SettingInfo::Enum("Sleep Screen Cover Mode", &CrossPointSettings::sleepScreenCoverMode, {"Fit", "Crop"}),
     SettingInfo::Enum("Status Bar", &CrossPointSettings::statusBar, {"None", "No Progress", "Full"}),
     SettingInfo::Enum("Hide Battery %", &CrossPointSettings::hideBatteryPercentage, {"Never", "In Reader", "Always"}),
@@ -41,8 +47,7 @@ const SettingInfo settingsList[settingsCount] = {
                       {"1 min", "5 min", "10 min", "15 min", "30 min"}),
     SettingInfo::Enum("Refresh Frequency", &CrossPointSettings::refreshFrequency,
                       {"1 page", "5 pages", "10 pages", "15 pages", "30 pages"}),
-    SettingInfo::Action("Calibre Settings"),
-    SettingInfo::Action("Check for updates")};
+    SettingInfo::Action("Calibre Settings"), SettingInfo::Action("Check for updates")};
 }  // namespace
 
 void SettingsActivity::taskTrampoline(void* param) {
@@ -155,6 +160,30 @@ void SettingsActivity::toggleCurrentSetting() {
         updateRequired = true;
       }));
       xSemaphoreGive(renderingMutex);
+    } else if (strcmp(setting.name, "Calendar Server URL") == 0) {
+      xSemaphoreTake(renderingMutex, portMAX_DELAY);
+      exitActivity();
+      enterNewActivity(new KeyboardEntryActivity(
+          renderer, mappedInput, "Calendar Server URL", SETTINGS.calendarServerUrl, 10,
+          255,    // maxLength
+          false,  // not password
+          [this](const std::string& url) {
+            strncpy(SETTINGS.calendarServerUrl, url.c_str(), sizeof(SETTINGS.calendarServerUrl) - 1);
+            SETTINGS.calendarServerUrl[sizeof(SETTINGS.calendarServerUrl) - 1] = '\0';
+            SETTINGS.saveToFile();
+            exitActivity();
+            updateRequired = true;
+          },
+          [this]() {
+            exitActivity();
+            updateRequired = true;
+          }));
+      xSemaphoreGive(renderingMutex);
+    } else if (strcmp(setting.name, "Test Calendar Now") == 0) {
+      xSemaphoreTake(renderingMutex, portMAX_DELAY);
+      exitActivity();
+      enterNewActivity(new CalendarActivity(renderer, mappedInput));
+      xSemaphoreGive(renderingMutex);
     }
   } else {
     // Only toggle if it's a toggle type and has a value pointer
@@ -206,6 +235,11 @@ void SettingsActivity::render() const {
       valueText = settingsList[i].enumValues[value];
     } else if (settingsList[i].type == SettingType::VALUE && settingsList[i].valuePtr != nullptr) {
       valueText = std::to_string(SETTINGS.*(settingsList[i].valuePtr));
+    } else if (settingsList[i].type == SettingType::ACTION) {
+      // Show [Set]/[Not Set] for URL-based action settings
+      if (strcmp(settingsList[i].name, "Calendar Server URL") == 0) {
+        valueText = (strlen(SETTINGS.calendarServerUrl) > 0) ? "[Set]" : "[Not Set]";
+      }
     }
     const auto width = renderer.getTextWidth(UI_10_FONT_ID, valueText.c_str());
     renderer.drawText(UI_10_FONT_ID, pageWidth - 20 - width, settingY, valueText.c_str(), i != selectedSettingIndex);
diff --git a/src/main.cpp b/src/main.cpp
index 8a7c3b91..86c7324e 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -6,6 +6,7 @@
 #include <SDCardManager.h>
 #include <SPI.h>
 #include <builtinFonts/all.h>
+#include <esp_sleep.h>
 
 #include <cstring>
 
@@ -16,6 +17,7 @@
 #include "activities/boot_sleep/BootActivity.h"
 #include "activities/boot_sleep/SleepActivity.h"
 #include "activities/browser/OpdsBookBrowserActivity.h"
+#include "activities/calendar/CalendarActivity.h"
 #include "activities/home/HomeActivity.h"
 #include "activities/network/CrossPointWebServerActivity.h"
 #include "activities/reader/ReaderActivity.h"
@@ -290,6 +292,16 @@ void setup() {
 
   SETTINGS.loadFromFile();
 
+  // Check if this is a timer wake for calendar mode
+  esp_sleep_wakeup_cause_t wakeupCause = esp_sleep_get_wakeup_cause();
+  if (wakeupCause == ESP_SLEEP_WAKEUP_TIMER && SETTINGS.calendarModeEnabled) {
+    Serial.printf("[%lu] [   ] Timer wake detected - entering calendar mode\n", millis());
+    setupDisplayAndFonts();
+    exitActivity();
+    enterNewActivity(new CalendarActivity(renderer, mappedInputManager));
+    return;  // Skip normal boot flow
+  }
+
   // verify power button press duration after we've read settings.
   verifyWakeupLongPress();