Rappahannock Oyster Bar hosts happy hour every Friday at Union Market. (Photo by Jahi Chikwendiu/The Washington Post)

Mixologist Dan Searing, the author of “The Punch Bowl,” will be mixing up a seasonal gin punch with cranberry liqueur at Buffalo and Bergen from 4 to 7 p.m. He’ll sign copies of his book, discuss making punches for large parties and, most importantly, hand out free cups of fresh punch.

(You can head to the nearby Salt and Sundry shop to pick up bitters, tonics and other ingredients used in Searing’s recipes, as well as punch glasses and cocktail guides.)

Union Market is hosting holiday happy hours on Fridays leading up to Christmas, with drink specials at Buffalo and Bergen and the Rappahannock Oyster Bar and photo opportunities with the Grinch.