damn, i think you just got effed in the a. $375 for a mirko and spoiler? wow. you should have just dropped off the pieces before you put them on the car. i did that at a very good shop with the tailgate on my old truck and i got paint and clearcoat on that for $80.
and all that with overspray all over your car! sorry man. make sure they pay to get that fixed.
you should still come to the meet though