We definitely welcome new members, and the forum is a great place to chime in on the discussion! Unless I'm mistaken, I don't think the McDonald's Cruise-In is an officially-sponsored or scheduled 'club participation' event for the WWF club. There may be some club members there, but I'm not sure how structured it will be for us as a club.
I'm the one that inputs events onto the WWF calendar, so if it's a club-sposored event then I will change it to the correct category. We (I) try to post ALL events that may be of interest to our membership as well as other Western WA car enthusiasts, and the event list covers quite a large array of interests. You can sort by event type by going to the main WWF site (http://www.WWFirebirds.com) and clicking on the category at the bottom-left of the screen. If something is mis-categorized, then let me know and I'll correct it.
Thanks for the heads' up and hopefully we'll welcome you and/or your son to the club!

BOP = BMW, Olds, & Pontiac
Past: countless BMWs, Cutlass's, Birds, GTOs, Caddys, VWs, & Jeeps
Present: a 3, a 7, a 442, a GTO, a Bird, & a jet boat--some even run!
Future: '87 BMW 325 V8 & '73 Drag Bird