Give Admins the ability to control Attended Event tag. I may need to pull a list of event attendees from last year.

The "Attended Event" tab is a temporary tag, and it only applies to constituents who've attended an event in the last two weeks.

"This tag indicates someone who recently attended an event with your organization in the past two weeks."
From: https://www.blackbaud.com/files/support/howto/coveo/renxt/bb-tags.html