My daughters sil works at a small beer and burger place and wanted to sponsor a bike show as a fun thing to do on a weekend. So she asked a few patrons and a few family member for ideas and set a date. A few posts went out on Facebook pages and were shared. A sign went up in front of the restaurant and the show was on.
About 45 bikes showed up, and the place was busy all Sunday afternoon. There were 3 different categories of bikes, vintage, custom and stock. No rule book to decide what category restrictions were, like how old vintage was, just up to the rider what category they wanted to be in.
This really turned out to be a fun way to spend a hot Sunday afternoon. Prizes were awarded based on popular vote, everyone in the place could vote. So if you are looking for a fun event, maybe look at your local motorcycle shop to team up with.