Many people drink champagne on special occassions. Actually they drink champagne, or a Méthode champenoise, exclusively on special occassions.
“Any occassion is good enough to drink Champagne”
And then there is the Duck Dogma:
“Whenever you see Duck, eat it”
(I am pretty sure there is a quote that states almost the same as my Champagne principle but I could not find it not even here)