Curfew

So, my curfew right now is 12, which is really frustrating me because I'm 18 and my parents refuse to let me out any later than that. I'm going off to college soon, and just for the summer I want to be able to go out with my friends and have fun before I leave, since I probably won't see them for a really long time. I know I'm living under their roof, but I have no choice until I'm off to college. It's not like I can get an apartment for 2 months. Advice?