Dionysus
Dionysus is the god of wine, grapes, orchards, and going batshit fucking crazy. His parents are up for debate, but (almost) everyone agrees his father is Zeus. His mother is either Semele, Demeter, or Persephone. In real life, the cult of Dionysus considered drinking wine to be a holy act, and therefor mostly amounted to a big group of rowdy drunks praising the name of Dionysus. Better than Jonestown, eh?
Shockingly, the god of alcoholics is chaotic neutral. His worshipers are just as likely to be jovial friends as they are to be bloodthirsty murderers. Deities & Demigods says this is because of the dual nature of alcohol, making people both happy and insane.
His followers are all those fond of a stiff drink, a party, or raving lunacy. Players looking to make Dionysus their deity need look no further than almost every bard stereotype ever, or failing that they could go full blown down the lunacy path and make a character that is absolutely barking mad.