I've been a fly on the wall on this topic now and again. I love San Francisco. Hubby will be there on business and I'm going along for the ride, but that's not 'til next October.
I've been wondering, I know that some of you have already met on other occasions and have had a great time together. Have you thought of renting a house or a condo and splitting the cost between a few of you?
VRBO (link below) has a number of weekly rentals, anywhere from a studio, sleeping 2 to a 7-bedroom, sleeping 12. The group would have a place to get together.
I've rented vacation homes a number of times from owners who advertise on VRBO, as well as Cyberrentals, and my experiences have been very positive.
VRBO
My two cents worth!