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]