saturnalia (n.) Look up saturnalia at Dictionary.com
"time of merrymaking," 1590s, from Latin Saturnalia, ancient Roman festival of Saturn (held in December), a time of merrymaking for all, from neuter plural of adjective Saturnalis "pertaining to Saturn," from Saturnus (see Saturn). The extended sense of "period of unrestrained revelry" is first attested 1782.