Spark gives you additional control over its built-in calendar. For example, you can set multiple default notifications for new events and choose the most convenient calendar view.
You can receive up to 5 notifications for every calendar event. For example, Spark can send you the first alert one day before an event, the second one two hours before, etc. Creating default alerts helps you save time while adding a new event (but you can also manually change alerts for a specific event).
Spark for Mac allows you to change the calendar view. For example, you can set the day to start the week on or enabled the three days view.