Somebody, usually our Cool Loser heroine, is throwing a party. Perhaps it's her first "grown up party", maybe it's a fairly major birthday, like her sweet 16th or her "now you're a teen!" 13th. However someone else, usually the Alpha Bitch, has found out about this and scheduled a bigger, better and unsupervised party on the same day and time as the Cool Loser's party.
Of course everyone at [...] [tvtropes.org]