Well it looks like there are more Neys than Yehs with the meet-up date of the 19th of June. Maybe the date needs to be changed to draw more attendance. I live in the Gig Harbor area and would be interested in a Northwest Meet-up.
As far as camping or boonedocking near Whistler... there just has to be something rad between Squamish and Lillooet. I have done a few day trips in the area on my motorcycle... including forest service roads - but I have not had the opportunity to camp in the area.
and if you know of or find a cool area to camp pass it along as that is on my short list of places to go with the SMB. I too have been motorcycling around there (most dual sport riding) but never camping nor with the SMB. Mt Baker has a lot of wilderness and is also on my short list as well.