Saturnalia, Ancient Rome
Saturnalia was awesome. It was a Roman solstice festival in honor of Saturn, the god of agriculture and time (you'd think it would take different skill sets to rule those things, but nope). Revelers met for a banquet at the Temple of Saturn, then delightfully overturned many social norms: gambling was permitted and masters served their slaves. There is only one rule for celebrating Saturnalia: party your face off. Pictured: the ruins of the Temple of Saturn (if only those columns could talk!).