Most adult-themed parties provide guests with alcoholic beverages. Attending a wedding reception involves holding a glass of champagne aloft in order to toast the couple’s good fortune. Accepting a New Year’s Eve invitation also means downing champagne at the appointed hour, ringing in the new year with a bit of an alcohol bang. Even going to a dinner party involves an alcohol commitment, as hosts often expect their guests to bring along booze to help cut the costs of holding a party.