All the below are only my opinions

First an 'Elite' jam session is an oxysymoron (sorry about spelling!!) or just not possible. The whole idea of playing in a session is to get everyone playing together, no showing off playing loads of unusual stuff, anyone can do that. The track in a session is to stay in the background unless it needs a leader and just put your tune in now and then that everyone will know. Sessions do have different standards and many irish sessions tend to be fast and furious, but if a bigginer walks in I would play something at the level I THINK they are at or encourage them to start one. If you become eliteist you also become insular, inwardlooking and insulting to other musicians who if anything you should be encouraging, after all music is music isn't it?

Cheers, Sam