I recall some fastrax folks commenting that 1:20's (meaning 1:20-1:29) was WAY too fast for novice at Beaver.   Now,  I think thats a load of crap,but I also think 1:05 minimum at beaver for Advanced is a load of crap.   You have to remember its a track day,  not a race.  Most folks will agree that A group trackday pace should be off race pace somewhat. In fact,  a buddy of mine was coaching someone at the Beaver day last fall and while running 1:12's they were literally passing everyone in Open.   To the OP,   try Open, get with a coach,   and if you feel in over your head after a session or two,  drop back down to Novice.  There is no way Todd wouldn't accommodate you if you felt out of place in Open.