You could have an IRC brawl event, where two teams are given ops on a channel, at the same time, and each team tries to ban and kick the other team within a certain period of time. Wildcard bans would not be allowed, and after the time's up, the number of participants on Team A are counted, and the number on Team B, and the team with the most still online wins.
Nickname faking and usage of mibbit highly encouraged.