Backfire Moto is a Motorcycle Night in Seattle (Ballard) Washington dedicated to Cafe Racers, Vintage Motorbikes, Rat Bikes, Metric Bobbers, Scooters and Mopeds. It is every third Wednesday and yes, they try to keep it year round.
There is a little bit of everything, from Harleys to scooters. I've only been there once and it was a great time. Go check it out!