I'm slightly surprised that anyone would even consider being intimidated by another musician in a session (*Guitarist stares fucking hard at the floor*). I freak out whenever I go to work cos I play with amazing musicians every day. I hope that the twentysomethings were invited to play at the big session because, although they get over excited and play too fast or play tunes that aren't that well know sometimes, they do sessions well and are accommodating as musicians (maybe not as people).