I think I would skip the level of unit leadership althogether and talk to no one lower than the event organizer level. Our units aren't really organized with any reall off-field power - an event authority is the lowest level that could say "this behavior must cease" with any hint of authority. You could also be placing yourself in a situation that might escalate into something personally dangerous. At the same time, I wouldn't leave it totally in their hands. I would hand it over and stay engaged in a "if you aren't going to call someone I will" understanding.
Pine River Boys, Co I, 7th Wisconsin
"We're... Christians, what read the Bible and foller what it says about lovin' your enemies and carin' for them what despitefully use you -- that is, after you've downed 'em good and hard."
-Si Klegg and His Pard Shorty