Hmmm... maybe spread the word among other attendees to bring this up with security on the way in. Let them know... a couple of quick ejections might be an overall curative. If security is pre-warned that will help. Maybe a few calls to the office, starting now, to forward through the chain might help even more.
Better than being a hero in a scuffle, unless it's to aid/assist against injury, and getting kicked out along with the perpetrators.
Either that or have Kelly Stafford throw a big soft pretzel at 'em. That oughta do it.