The main days of the gathering are Thursday, Friday and Saturday morning, December 29, 30 and 31st. The shortest practical stay would be Thursday and Friday nights at the hotel.
The slightly longer, don't-miss-anything, stay would be Wednesday night through Saturday.
The hotel will honor the conference rates from Monday December 26th through the following Sunday night, January 1.
Every night of hotel-room goes toward credit for less expensive (or maybe free, if enough people attend) conference rooms.
Hotel Reservations, halfway down. (Can be made by e-mail or phone.)
(Which I have repaired to reflect what is happening, as opposed to what would have been happening if we had had a July gathering... it's updated, and corrected, today.)