hilarity
n.a lot of laughter and fun. You use this to describe a situation that is very funny and full of excitement.
n.a state of great amusement and laughter; a period of intense mirth. Often used to describe a social event or a specific moment of high entertainment.
“The party was full of hilarity and music.”
“The children's laughter and general hilarity filled the entire park during the summer festival.”
“What began as a simple dinner party quickly devolved into a night of unbridled hilarity, with guests sharing increasingly absurd stories that kept the conversation alive until dawn.”
From Latin hilaritās (“cheerfulness”), from hilaris (“cheerful”), from Ancient Greek ἱλαρός (hilarós, “cheerful”).
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.