Tools - Homepage Features: Scheduling
Related: Creating a Homepage Feature
This will take you to a page where you can select a date and time range for your homepage features to show up on the homepage.
Once you select the date range from this page, you will see it in the drop down menu in the top left corner.
In order to create features for a set date range, make sure to select the date range from the drop down menu and then set your features/events for that date range.
*Tip* - If you see features on your homepage that don't match to what you see in Spark, make sure to check this drop down menu to make sure there are no date ranges set for that day.