A formal dance held on Christmas night when a Triwizard Tournament is occurring. This is basically Christmas prom where the same usual goes for four hours straight.
Ranka: Hey Susumu, will you take me to the Yule Ball?
Susumu: Sorry Ranka, I can't. Konata in the grade above me asked me.
Susumu: Sorry Ranka, I can't. Konata in the grade above me asked me.
by The Real Driller June 26, 2017
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