celebratory

adj

1. Having the manner of, or forming part of, a celebration.

   “Hiro ducks out of Tranny's celebratory dinner rather early, drags Reason off the zodiac and onto the front porch of the houseboat, opens it up and jacks his personal computer into its bios.”

   “But, with United fans in celebratory mood as it appeared their team might snatch glory, they faced an anxious wait as City equalised in stoppage time.”