As for relocating the RAAFA show to the local beaches.. well, I'd love to know, and have asked the same question previously, how exactly could this be done? Relocate the static displays, concessions etc to the beach? Er, no. Have the 20,000 or so spectators rush a couple of miles across the A259 over to the beach to catch the displays and then run back? Probably not.
How many can be accommodated at Lancing Beach Green ?
Otherwise Brighton ... apart from the i360 getting in the way.
These are only alternatives if needed.