I've never seen why people go to shows;
I think the more restrictive shows (all Chevy or all Mustang for ex.) are more competitive, thus less fun.
I started going to hang out with my FIL and his goofy friends. They all have street rods, and those cars look all the same to me.
As far as I'm concerned , any NSRA show was just jelly bean colored, big fendered cars.
Then they started "allowing" later cars, up to 82 (I think) and it started getting more interesting.
That morphed into hitting more open shows and I really just had a good time looking at a wide variety of stuff. Now I go mostly to shows that allow anything. It's fun to walk around and see a 54 Belair sitting next to an 85 Monte SS sitting next to a new Charger sitting next to rat rod sitting next to a motorcycle.
Gimme a Gremlin or a Vega and that's a car show.
Plus, the $$ usually goes to a charity and I feel pretty good about that.
And usually, the cranky-old man-know-it-all is a rarity. Lots of interesting characters and stories at most shows.
The doddering old fool that cleans his calipers with a q-tip while downing everyone else's car is more entertaining than irritating.