Excuse for skipping track meet?

ok, so i have a track meet tomorrow afternoon, which i really dont feel like going to in the first place. and my girlfriend and i were going to hang out today, but she couldnt, so tomorrow is the only time ill be able to hang out with her for a while because shes pretty musy. idk what to tell my parents, like,theyll get pissed if i tell them im skipping it just to hang out with my ladyfriend. and suggestions?