Here's a couple more reported frequencies in use:
135.65
123.425
The various fly-bys, demonstrations, etc., will probably be using
their own discrete frequencies. If you are at the event with a
scanner you may be able to find out from others in attendance
what other frequencies are in use, or take pot-luck and scan
the aero frequencies and hope for a catch. Try your close-call
feature if you have one on your scanner.
Bill