Allentown is a very good show and quite large. If you go on Saturday, the farmer's market in the same parking lot is open, it is closed on Sunday. That also is very large. Saturday is a very busy day at the show while Sunday is well attended, it is a little easier to navigate the show.
Many dealers and many private folks selling at Allentown. Never been to it, it is worth the drive from one state to the next state.