Yep the BBQ is after the gates have shut to the public and takes place inside the fenced aircraft area.
Will be working there all 3 days myself but hope to find time to have a look around and say hi to a few people, might even get to grab a burger at the BBQ.
Not sure what aircraft are going to be there over the weekend other than the usual mix of fly in types however did see this afternoon a CH53, couple of Huey's, 412, 109, Chinook and a few others parked up when I went by. No doubt there will be a couple of cabs from the defence school there (no way they would say no to a night on the pop).
Lets just hope the weather is as promised.