As far as the flying goes, the most popular frequencies will be the tower and the air boss. These may be one and the same, as it was last weekend at Barnes, or they may be two different. If you're seeing this early on Saturday morning, start with the tower frequency and listen to see if the controller gives the air boss' frequency on the air. If not and you don't hear the air boss on the air by the time the flying starts, you'll have to hunt for it. The air boss almost always has a VHF and UHF frequency in use.
Anytime two or more planes are in the air at the same time, they will work an air-to-air frequency. For civilian acts and heritage flights (mix of old military aircraft and modern-day ones) this will generally be in the aviation VHF band. Search in the 122, 123 and 136 MHz ranges, those are the most popular but there may be others.
The parachute teams will always work and air-to-ground frequency. This might be in the aviation VHF band, it may not. Last week the Golden Knights used 123.150. And they've been logged on others as well in the past.
The Blue Angels appear on UHF. AIR, they work 3 frequencies when airborne, one by the diamond, one by the soloists and one called "show center" which both flights switch to when they get over the show center point.
Be sure to hunt up Larry Van Horn's outstanding guide to monitoring airshows. It's loaded with very useful frequencies and will probably allow you to hear 90%+ of the action.
Happy listening!
