I've been going to the ~New Hampshire Vintage Celebration~ for years, first as a fan and for the last few years as an entrant (in my Sprite).
But as well as cars (and a very old airplane) I also have some bikes. My street bike is a Honda Ascot 500 thumper and I am an earned Life Member in the AMA. Anyway, I always enjoy the bikes at the NHMA event as much as the cars.
Here is something you'll hardly see anywhere else (below): a Vincent sidecar outfit!
You have to see the sidecar outfits to believe them! Especially the "monkeys"! Who needs the Isle of Man when you have New Hampshire. I am also a big fan of the 50 cc "tiddler" class road racing bikes. Gotta love 20,000+ RPM with 10+ gears! The pictures below were taken this year and last year.
More sidecars and old bikes.
spun out on track-push starting
our "pit-bike / sidecar outfit"

