Day-before email with location, gameplay time(s), parking / TTC info, and partner for the evening (if we choose to have a different one every time). Also include a map of the area and the different ways to enter, so folks can refer back each time. The point of this is to act as a reminder, give everyone the details they need to know ahead of time, and lean on commitment principle (you have a partner who will be waiting on you to get there).