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: Super Grand Prix $75
6) Matt: Super Grand Prix $75
7) Casper
8) Justin (a coworker that Dean knows): Super Grand Prix $75
9) Brent (friend of Piett): Super Grand Prix $75
10) Wife of XPLORx4: Super grand Prix $75
11) Jonathan (another coworker that Dean knows): Super Grand Prix $75

BTW, there is a one-time fee of $5 per person for a driver's license, so the total cost per person is $80 (excluding food).