Not sure about any upcoming Rally's in my area (Seattleish). One of 'em just happened as I recall, but there is at least one big ride coming up.
The Ferry to Ferry ride.
50cc friendly. last year our mascot & pace vehicle was a Honda Gyro ridden by a local shop owner.
http://www.motorscooterguide.net/Honda/Gyro/Gyro.html
Further info on the event can be found here.
https://www.facebook.com/events/2100...31961488086864