The event kicked off at noon and goes till 7:00 Saturday evening. It features live music, food booths, and a bike show. A kid's bike adventure let kids ride a modified motorcycle in a controlled environment.
Organizers say the rally is a great opportunity to show off downtown Princeton; and get people excited about growth in the area.
'I think it's just gonna grow and grow and get bigger and better every year. We've got a few things this year we didn't have last year that we've added to it - so we think we have more to attract people," said co-chairman of the event, Greg Goodson.
And one of things they've added this year is inviting folks to 'make it thunder' - that's when all the bikers rev their engines all at once.