The American Legion Riders Chapter 28 Veterans Car and Motorcycle Show. Petaluma Veterans Memorial Building, 1094 Petaluma boulevard So. Petaluma, Ca. Sunday August 20th 2023. Entry fee $25. A free dash plaque to the first 100 entries. Spectators are free. Registration 7:30 a.m. to 9:00 a.m. show 9:00 a.m. to 3:00 p.m. music, food, and raffle prizes.