Events can seem to disappear when their status changes, and an event code can be "in use" by an event you can't see.

Can't find an event

• Check Recent Items. Click the clock icon at the top of the page. Events you opened recently are listed there, even deleted ones.
  
• Check the filters on your Event List. The Status filter can hide events such as Closed or Cancelled ones. The date filter next to it can hide past events. Try an option like Ended in last 90 Days, or search by name, code, location or external ID.
  
• Ask your Administrator. If your user only sees events where you have a role, someone needs to give you a role on the event.

"Event code already in use"

Every event code must be unique, including codes on inactive, closed or deleted events.

1. Find the event that has the code, using search or Recent Items.
2. Open Event Setup > Details and change its Event Code, for example by adding "-old".
   
3. Save, then use the code on your new event.

The same applies to an External Event ID that belonged to a deleted event: open the deleted event and change its ID first.

Restore a deleted event

A deleted event can be restored. For the steps, see How to delete or restore an event

Next step: Check Recent Items first; most "missing" events are there.