All I can say is Loation, Location, Location. In late march early April I went to the Heirloom show in Portland, Oregon they had at the most I would say 15 booths and not alot of merchandise.. Other then Tessler who usually has a lot of ink pads and more. Also hardly anyone was there very small attendance.
So this weekend and about 2 hours away in Puyallup, WA there are about 30 or more booths. The place was packed and wow the supply people have. I would think since Portland is not that far from Puyallup you would have similiar attendence and vendors.