Battlegrounds event (Inspired by PUBG)
Several girls are placed around randomly in some sort of industrial complex, with many separate rooms. THere are random weapons lying around here and there (like chairs, etc.), and every now and then some rooms lock themselves, and any girl stuck inside is eliminated (there is a timer above doors, to show this). Otherwise, we can havy any elimination rules (KOs only, KOs plus submissions, etc.), obviously, last girl standing wins.
Christmas event
In each weight group, there is a large Battle royale match. In the heavyweights LAW chooses its 'Santa', from the midweights a 'Reindeer' and from the lightweights 'an elf'. There could be some extra storylines involving the winning characters, but there isn't a lot more to it.
New Year's event (Inspired by this thread)
The wrestling event would start something like 10-20 minutes before midnight on New Year's Eve. a larger amount of girls gets into the ring, with bottles of champagne placed around in and outside the ring. Until midnight only KOs count as a loss, and everyone has to drink as much champagne as they can. At midnight the match is paused, and officials do a breathalyzer check on all the girls. In order to pass you have to be drunk (the limit would be set so that they aren't just a little tipsy, but properly drunk), anyone below the limit is disqualified. The remaining girls fight with elimination by pinfall or submission, or battle royale rules.