A two-hour drive? I'd suggest taking some wash supplies (bucket, mitt, shampoo, drying towels, QD) along with you and finding a blast-o-matic wash bay in the town where the meet is being held. Use the wash bay's wand set to rinse to fill your bucket, and do the initial spraydown of your car (pay special attention to all those dead bugs you're sure to have on the leading edges). Then wash as normal, and again use the wash bay's spray to rinse. Dry and QD, and you'll be shiny for the show
I know that's a lot of work right before the show, and it will add to your "travel" time, but I'd be hesitant to just QD after a drive that far; I'd be worried about dead bugs and road grime causing scratches. On the upside, you'll have one of the cleanest cars there if a lot of other people are driving in for the show . . .
Tort