diff --git a/backend/src/handlers/events.rs b/backend/src/handlers/events.rs
index 500f99f..ba9ca2d 100644
--- a/backend/src/handlers/events.rs
+++ b/backend/src/handlers/events.rs
@@ -417,11 +417,19 @@ pub async fn create_event(
     let end_datetime = parse_event_datetime(&request.end_date, &request.end_time, request.all_day)
         .map_err(|e| ApiError::BadRequest(format!("Invalid end date/time: {}", e)))?;
 
-    // Validate that end is after start
-    if end_datetime <= start_datetime {
-        return Err(ApiError::BadRequest(
-            "End date/time must be after start date/time".to_string(),
-        ));
+    // Validate that end is after start (allow equal times for all-day events)
+    if request.all_day {
+        if end_datetime < start_datetime {
+            return Err(ApiError::BadRequest(
+                "End date must be on or after start date for all-day events".to_string(),
+            ));
+        }
+    } else {
+        if end_datetime <= start_datetime {
+            return Err(ApiError::BadRequest(
+                "End date/time must be after start date/time".to_string(),
+            ));
+        }
     }
 
     // Generate a unique UID for the event
@@ -707,11 +715,19 @@ pub async fn update_event(
     let end_datetime = parse_event_datetime(&request.end_date, &request.end_time, request.all_day)
         .map_err(|e| ApiError::BadRequest(format!("Invalid end date/time: {}", e)))?;
 
-    // Validate that end is after start
-    if end_datetime <= start_datetime {
-        return Err(ApiError::BadRequest(
-            "End date/time must be after start date/time".to_string(),
-        ));
+    // Validate that end is after start (allow equal times for all-day events)
+    if request.all_day {
+        if end_datetime < start_datetime {
+            return Err(ApiError::BadRequest(
+                "End date must be on or after start date for all-day events".to_string(),
+            ));
+        }
+    } else {
+        if end_datetime <= start_datetime {
+            return Err(ApiError::BadRequest(
+                "End date/time must be after start date/time".to_string(),
+            ));
+        }
     }
 
     // Update event properties
diff --git a/frontend/src/components/week_view.rs b/frontend/src/components/week_view.rs
index 6a5f366..cd9c139 100644
--- a/frontend/src/components/week_view.rs
+++ b/frontend/src/components/week_view.rs
@@ -319,11 +319,52 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                     week_days.iter().map(|date| {
                         let is_today = *date == props.today;
                         let weekday_name = get_weekday_name(date.weekday());
+                        let day_events = props.events.get(date).cloned().unwrap_or_default();
+                        
+                        // Filter for all-day events only
+                        let all_day_events: Vec<_> = day_events.iter().filter(|event| event.all_day).collect();
 
                         html! {
                             <div class={classes!("week-day-header", if is_today { Some("today") } else { None })}>
-                                <div class="weekday-name">{weekday_name}</div>
-                                <div class="day-number">{date.day()}</div>
+                                <div class="day-header-content">
+                                    <div class="weekday-name">{weekday_name}</div>
+                                    <div class="day-number">{date.day()}</div>
+                                </div>
+                                
+                                // All-day events section
+                                {if !all_day_events.is_empty() {
+                                    html! {
+                                        <div class="all-day-events">
+                                            {
+                                                all_day_events.iter().map(|event| {
+                                                    let event_color = get_event_color(event);
+                                                    let onclick = {
+                                                        let on_event_click = props.on_event_click.clone();
+                                                        let event = (*event).clone();
+                                                        Callback::from(move |e: MouseEvent| {
+                                                            e.stop_propagation();
+                                                            on_event_click.emit(event.clone());
+                                                        })
+                                                    };
+                                                    
+                                                    html! {
+                                                        <div 
+                                                            class="all-day-event"
+                                                            style={format!("background-color: {}", event_color)}
+                                                            {onclick}
+                                                        >
+                                                            <span class="all-day-event-title">
+                                                                {event.summary.as_ref().unwrap_or(&"Untitled".to_string())}
+                                                            </span>
+                                                        </div>
+                                                    }
+                                                }).collect::<Html>()
+                                            }
+                                        </div>
+                                    }
+                                } else {
+                                    html! {}
+                                }}
                             </div>
                         }
                     }).collect::<Html>()
@@ -611,8 +652,13 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                 day_events.iter().enumerate().filter_map(|(event_idx, event)| {
                                                     let (start_pixels, duration_pixels, is_all_day) = calculate_event_position(event, *date);
 
+                                                    // Skip all-day events (they're rendered in the header)
+                                                    if is_all_day {
+                                                        return None;
+                                                    }
+
                                                     // Skip events that don't belong on this date or have invalid positioning
-                                                    if start_pixels == 0.0 && duration_pixels == 0.0 && !is_all_day {
+                                                    if start_pixels == 0.0 && duration_pixels == 0.0 {
                                                         return None;
                                                     }
 
diff --git a/frontend/styles.css b/frontend/styles.css
index 879bbda..9b4e63a 100644
--- a/frontend/styles.css
+++ b/frontend/styles.css
@@ -650,11 +650,14 @@ body {
 }
 
 .week-day-header {
-    padding: 1rem;
+    padding: 0.5rem;
     text-align: center;
     border-right: 1px solid var(--time-label-border, #e9ecef);
     background: var(--weekday-header-bg, #f8f9fa);
     color: var(--weekday-header-text, inherit);
+    min-height: 70px; /* Ensure space for all-day events */
+    display: flex;
+    flex-direction: column;
 }
 
 .week-day-header.today {
@@ -680,6 +683,45 @@ body {
     color: var(--calendar-today-text, #1976d2);
 }
 
+/* All-day events in header */
+.day-header-content {
+    flex-shrink: 0;
+}
+
+.all-day-events {
+    flex: 1;
+    display: flex;
+    flex-direction: column;
+    gap: 2px;
+    margin-top: 0.5rem;
+    min-height: 0;
+}
+
+.all-day-event {
+    background: #3B82F6;
+    color: white;
+    border-radius: 4px;
+    padding: 2px 6px;
+    font-size: 0.75rem;
+    text-align: left;
+    cursor: pointer;
+    border: 1px solid rgba(255,255,255,0.2);
+    min-height: 18px;
+    display: flex;
+    align-items: center;
+}
+
+.all-day-event:hover {
+    filter: brightness(1.1);
+}
+
+.all-day-event-title {
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+    flex: 1;
+}
+
 /* Week Content */
 .week-content {
     flex: 1;