Just as well pixels don't have calories though. With all of the cake, cheese and drink on "offer" by my publishers and myself, we'd have all put on extra pounds on the scales today and woken up with a nasty headache! I also got to choose some of my favourite music (You Tube based) to share, some of which reflected my writing by being stories in song with a definite twist to them.
Anyway, all of this led me to think about what kind of celebrations your fictional world would have. Would magic be involved to help the party along or is it banned (because combined with alcohol consumption perhaps nobody wants to risk it?!)? Does your world have its own literary world with writers promoting books? Does it have certain statutory events everyone has to go to, possibly on pain of death?
Who organises and pays for the celebrations? In the case of a dictatorship, are there celebrations which are banned and how do your people find a way of getting around this so they can keep their traditions going? All good stories to come from those thoughts I hope!