you hide the empty bottles in a trash bag and then you make one of your buddies take them to a dumpster on their way out.
but seriously, no drinking and driving, take their keys away when they get there and make them stay the night.
we had more successful parties when it was just 5 or 6 people. nothing got broken, nothing got puked on that couldn't be cleaned up on time, etc.
however, keep in mind that your parents were not just born yesterday and will eventually figure out there was a party and your butt will be toast.
ENJOY!