There's a visitor center, I want to say on International Drive. I'd stop in and ask them. There will be more within that category than you'd be able to do in a year.
The Old Town car show, I think, is only on Saturday nights. I may be wrong, but I know they do show up on Saturday.
I'd also add that a visit to downtown Celebration is worth the time. There's a few very nice places to eat including the Boston Tavern, the Market Street Café and the Columbia (one of our favorites). There are at least a couple more, but we've not tried them yet. There's a nice, and fully accessible, walk around the lake right downtown too.
Jay & Peggy Monroe with Dolly
Can't take it with you - don't plan on leaving any behind
2016 Newmar London Aire 4553, Spartan chassis
Wrangler Unlimited toad