A group of partygoers.
partygoer definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a person who goes to a party or attends many parties
partygoer definition by American Heritage Dictionary
One who attends parties or a party: The lobby was filled with partygoers.