Vintage Motorcycle Days is an AMA and AHRMA motorcycle event run at the Mid-Ohio race facility in Mansfield Ohio (170 miles from Detroit) that might be the biggest Vintage Motorcycle event on the planet... with an estimated 20,000 plus people from all over the country attending over a 4 day period in July.
There are a myriad of activities and races over the weekend.
A swap meet that covers about 5 outdoor acres.
Motorcycle roadracing on the professional RR track with bikes from all the way back to the 30's.. in many different classes all weekend.. speeds over 150 MPH for the fast ones.
A dynamometer trailer that runs almost continuously all weekend with people putting any kind of bike you can imagine up on the dyno to get a computer printout of their bikes HP and torque curves... $20... somebody told me they have put a Spree up on it.. and 200 HP bikes also.
Motocross races for old bikes running all weekend.
A bike judging show for old bikes judging their state of originality and condition.. with many brand new looking 20 to 50 year old bikes.
And one of my favorites.. a trick riding exibition by former World Trials Champion Tommi Ahvala from Finland.. he puts on this exhibition about 4 times a day.. don't miss it..wheelies, stoppies, jumping, balancing... Would you lay flat on the ground and allow one of the best riders in the world to ride right at you and 3 of your best friends lying hip to hip at 20 MPH and "jump" the bike over you with no take off ramp?.. Happens 4 times a day.. no shortage of volunteers.
Overnite camping, campfires, partying...$28 to get in for the weekend.. I don't know about camping.
Many bike specific clubs hold yearly meets together there.. and all congregate in one area.. like the 'Honda CBX Club"..etc... The Moped Army ?????
The access roads around the facility cover about 4 miles and one of the main forms of transport are... you guessed it.. mopeds.. and motorcycles of all types..it is a madhouse of two wheels.
A bizarre rule >>> no bicycles allowed !!!... weird.. and don't challenge the cops or security.. they can be dicks if you are breaking the rules.
Mid-Ohio, and the AMA, and AHRMA, all have websites.
Other than that.. I don't know a thing about it.