The Collaborative International Dictionary of English v.0.48:

Revelry \Rev"el*ry\, n. [See Revel, v. i. & n.]
   The act of engaging in a revel; noisy festivity; reveling.
   [1913 Webster]

         And pomp and feast and revelry.          --Milton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

revelry
    n 1: unrestrained merrymaking [syn: revel, revelry]

Moby Thesaurus II by Grady Ward, 1.0:

40 Moby Thesaurus words for "revelry":
   ball, banquet, carousal, celebration, cheer, conviviality, feast,
   festivity, fun, gaiety, good cheer, heartiness, high jinks,
   holiday-making, hoopla, jollification, jollity, joviality, joyance,
   jubilation, larking, mad round, mafficking, merriment, merrymaking,
   mirth, partying, racketing, regale, regalement, revel, reveling,
   revelment, revels, round of pleasures, skylarking, spree, treat,
   wassail, whoopee