Saturnalia

Saturnalia was an ancient Roman festival in honour of the deity Saturn, held on 17 December of the Julian calendar and later expanded with festivities through to 23 December. The holiday was celebrated with a sacrifice at the Temple of Saturn, in the Roman Forum, and a public banquet, followed by private gift-giving, continual partying, and a carnival atmosphere that overturned Roman social norms: gambling was permitted, and masters provided table service for their slaves.[1] The poet Catullus called it "the best of days".
-Wikipedia