When my granddaughter was in high school (she's a college freshman) her group of friends had their parties (booze free, of course) at the home of one of the guys in their group. If the party was going to last (like New Year's), it was a MANDATORY stay-over. They had a girls' "dorm" and one for the boys, well-chaperoned. The mom was not about to send teenage drivers headed home late at night with all the drunken bozos on the roads. How I admire her for that!