Professionally, "post-event" activities include debriefing, analyzing data, and sending follow-up surveys to measure ROI and improve future planning.
In athletics, a field event refers to competitions that occur on a field (like jumping or throwing) rather than on a track. You may be looking to find or list these events in a schedule.
For site owners using The Events Calendar or Divi , it refers to creating a "custom post type" for events, often involving custom fields like start dates or event descriptions.
On the FieldLevel sports recruiting network, college coaches can "post events" like camps to attract athletes by selecting the "+Post Event" link.
Divi 5 Loop Builder Tutorial: Event Calendar with Custom Fields