(n.) Pomp, show, or festivity.

Mardi Gras Saturnalia ball banquet blowout carnival celebration celebratory cheerful cheery convivial do event fair feast festal festival festive festive occasion festivity fete field day fiesta gala affair gala day gay gladsome gleeful great doings happening happy high jinks hilarious holiday holy day jamboree jolly jovial joyful joyous kermis merry merrymaking occasion on the loose pageant party picnic red-letter day waygoose wayzgoose