|Dorothy Lindman RPG Venture-Lieutenant, Washington—Seattle aka Gwen Smith|
It sounds like you have everything really well planned out. Here are a couple of suggestions that have worked well in our area:
Our Venture Captain prints out blank sign up sheets with the event name and event code already filled in so the GMs don't have to worry about it, and GMs have the event code handy when filling out chronicle sheets.
For newer locations where we had a lot of walk-ins, we started capping tables at 4 players. That leaves room for walk-ins while reducing the risk of not having enough players to run a table.
We started with a GM supply box with wet and dry erase markers, pens/pencils, initiative cards, business cards with the local website and main PFS websites, loaner dice, pawns and bases, beads for counters or miscellaneous markers on the map, a measuring tape (for "is he in range of my bow" or "do I have charge lane" type questions)--things like that. We also have a file box with extra blank flip mats, copies of the pre-generated characters, one or two copies of the Guide, faction information, secondary success conditions, blank inventory sheets, etc.
Basically, we kept a collection of random things that make life easier for GMs. Gradually, as the GMs got more experienced and collected their own supply boxes, it became less important. But we still keep it in the car in case someone forgets something or we need another GM at the last minute.