I believe it is also per-speaker-at-event, not simply per-event. So if there is a panel of ten people, that counts as ten deplatformings.
So something like this from their recent list:
> Turning Point USA scheduled a “Freedom Built to Last: Honoring Charlie Kirk” memorial at Utah Valley University, featuring a number of prominent conservative speakers. Students for a Democratic Society at UVU opposed the event honoring Kirk and his political legacy. The university declined to cancel the event, and it proceeded on Sept. 10.