i Register
In some senses, convivialist is marked as archaic. Watch for register when choosing this word.
noun
A person of convivial habits.
A person who drinks alcohol.
Herman Melville (1857), chapter 2, in The Confidence-Man, page 10: “…there was no lack of variety. Natives of all sorts, and foreigners; men of business and men of pleasure;…teetotalers and convivialists…”