John,
I help lead the Sunday rides out of New Seasons and also go on Doug's Tuesday & Thursday rides, and I'm not sure there is enough parking there, especially if it turns out to be a nicer day and lots of people show. We've had as many as 20 or so on the regular rides, and that seems to be the upper limit for that location. Those that drive generally park along NE 34th Avenue and stay out of the New Seasons/Walgreens parking lot. NE 34th is pretty narrow and we have to remind riders to stay out of the street so as not to block traffic. Another place where there is a lot more parking and less congestion is along the north side of Wilshire Park on NE Skidmore just east of NE 33rd Avenue. The problem with this location is I think the Portland Wheelmen have a regular Saturday morning ride that leaves from there.
Anyway, I thought I'd at least mention the possible congestion at New Seasons.