Just adding my vote to the consensus here 
5-6 participants per group, global participation (so I can participate), mixed style/technique/format/subject, and bimonthly (or thereabouts) submission.
Critique is optional, so is scanning/gallery presentation. The real prints is what's important.

5-6 participants per group, global participation (so I can participate), mixed style/technique/format/subject, and bimonthly (or thereabouts) submission.
Critique is optional, so is scanning/gallery presentation. The real prints is what's important.