29. At your scheduled convention event, allow "visitors" to play but make sure to give the glory to your home players, who are also sitting in. One good way to do this: give 1st-level characters to the visitors and 8th-level characters to your buddies, then make sure the challenges are suited to 8th-level characters.
32- Use a war-gaming tap measure (one of three attached to you belt) to handle all distances in combat. Insisting that hexes and grids are for people who haven't rated their int at 17+.