Sure, more can be invited, since up to 15 drivers at once can race. The only requirement is that whomever you invite doesn't mind hanging out with a bunch of 4-wheelin' enthusiasts.
As I mentioned previously, reservations are recommended for groups of 6 or more, so I would like to make reservations by Friday to ensure we can all race together. They require full payment at the time of reservation, so I will need payment from everyone prior to making the reservation.
Otherwise, we could all just show up and hope for the best.
1) XPLORx4: Super Grand Prix $75
2) Huey: Super Grand Prix $75
3) XSAL: Super Grand Prix $75
4) Wife of XSAL: Super Grand Prix $75
5) Piett
6) Matt
7) Casper
8) Justin (a coworker that Dean knows): Super Grand Prix $75