Gallus receives an invite from Grampa Gruff to attend a new observance of some sort. He and the rest of the Student Six take the old griffin up on his offer, resulting in a night they likely won't soon forget.
(Based on some events that take place during the Seinfeld episode "The Strike"; a.k.a., the one that introduced 'Festivus' to popular culture.)
RIP Jerry Stiller
please donate to the griffon fund this blue moon
I think there are a few lines where you wrote Gallus saying something when it should be Grandpa Gruff.