>>367430551
The people who ran the prom event last year announced extremely last minute that they would be requiring everyone to download a custom made mod that would cause their client to automatically block people that the organizers put on a blacklist. This was in the name of "preventing crashers" I believe. 

If you ask me, the organizers were just salty that they didn't have full control over who would be allowed at the event. They could personally block people they didn't like, but that wouldn't stop other participants who didn't care from seeing and talking to the blocked people. Hence the "solution".

Anyways, there was a lot of backlash and eventually the requirement was scrapped.