I've been to probably 7 or 8 events. I've never seen any insertion of any kind. Mostly I see impact play like whipping and flogging. I've seen a lot of suspension and rope bondage and a presentation on knife play which was really interesting.
We've also seen and done a little bit of electrical play which was a lot of fun.
actual penetration usually and anything that is going to leave bodily fluids usually isn't allowed at the events around here. Not sure if that's true in other places though.