White Rose is the best vintage Japanese on the east coast, bar none. What it lacks in size compared to VMD it more than makes up in charm and camaraderie. Be prepared to find parts for bikes you are looking for, bikes that are realistic in price, and people who really know and care about the bikes.
White Rose is where I foolishly let a pristine DT 400 get away one year and a nice XS 650 another year. I've never gone there and not wanted to bring something home. Most often I have.
I'll be at Bonneville this year but you shouldn't miss it!