I always used to drink after large gatherings in my home, primarily because it was so stressful! The preparation, the entertaining, the clean up, the being "on", its exhausting.
So, I would celebrate when it was over and sit back and relax with a cold one (or 12).
I would suggest perhaps outlining the following day after the big event, and making a schedule of things to do to stay busy. Maybe go to an AA meeting at some point to keep sobriety fresh on your mind. Just keep busy and have a plan! Good luck.