diff --git a/src/utils/AllDayLayoutEngine.ts b/src/utils/AllDayLayoutEngine.ts
index 31d5018..1afe7b9 100644
--- a/src/utils/AllDayLayoutEngine.ts
+++ b/src/utils/AllDayLayoutEngine.ts
@@ -30,11 +30,9 @@ export class AllDayLayoutEngine {
     // Reset tracks for new calculation
     this.tracks = [new Array(this.columnIdentifiers.length).fill(false)];
 
-    // Filter to only visible events
-    const visibleEvents = events.filter(event => this.isEventVisible(event));
-
     // Process events in input order (no sorting)
-    for (const event of visibleEvents) {
+    // Events are already filtered by DataSource before reaching this engine
+    for (const event of events) {
       const startDay = this.getEventStartDay(event);
       const endDay = this.getEventEndDay(event);
 
@@ -157,22 +155,6 @@ export class AllDayLayoutEngine {
     return endIndex;
   }
 
-  /**
-   * Check if event is visible in the current date range
-   */
-  private isEventVisible(event: ICalendarEvent): boolean {
-    if (this.columnIdentifiers.length === 0) return false;
-
-    const eventStartDate = this.formatDate(event.start);
-    const eventEndDate = this.formatDate(event.end);
-    const firstVisibleDate = this.columnIdentifiers[0];
-    const lastVisibleDate = this.columnIdentifiers[this.columnIdentifiers.length - 1];
-
-    // Event overlaps if it doesn't end before visible range starts
-    // AND doesn't start after visible range ends
-    return !(eventEndDate < firstVisibleDate || eventStartDate > lastVisibleDate);
-  }
-
   /**
    * Format date to YYYY-MM-DD string using local date
    */