In reply to snakes77:
Sorry to be the pessimist, but I would say dont even bother on a bank holiday, unless you like standing on belay ledges for 1 and 1/2 hours at a time.
There are quieter venues with quality routes at the grade you want - the Moelwyns? or close to Tryfan, Carnedd y Ffilliast.
Dont get me wrong - GA is a beautiful route - but try to savour it on a midweek or similar rather than the bank hol;iday circus.
Good luck and enjoy what ever you do.