revives date_planner (#2593)

date_planner/lib/event_task.dart

@@ -0,0 +1,14 @@
+// Copyright 2024 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+class EventTask {
+  String text;
+  bool isCompleted;
+
+  EventTask({required this.text, this.isCompleted = false});
+
+  static List<EventTask> buildList(List<String> taskDescriptions) => [
+    for (var task in taskDescriptions) EventTask(text: task),
+  ];
+}