So far both weekends in June (7-8 and 14-15) look open for me. My studio has a drum kit and bass rig, so any drummers need only bring their favorite sticks, bassists their favorite bass. Keyboards are covered --- 2 at once can play if they don't mind sitting in close proximity. I've got two vocal mic's and a small PA in place --- more mics and stands would be good if anyone else wants to sing. Chord charts of any favorite material would be helpful for those that may not have played a given song before.
It sounds like there might be enough people to tackle a variety of music --- not everyone has to play everything, so we can take turns with what everyone is happiest doing (or not doing, to be all Zen about it). Guitarists, in the interest of space I'd request that amps be of the smaller variety (no larger than a Twin or AC-30), and preferably ones you don't mind sharing --- if 10 players all bring their own amps, there may not be much room to stand, or playing time could end up being eaten up by equipment moving.
If we can narrow down the date and participants here, I'll send directions by e-mail to those who want to play. Looking forward to it, and to meeting some of this fascinating cast of characters!