Part of the problem with work parties (and parties in general), are the non-alcoholic beverage options: soda or water, usually. These are NOT equatable non-alcoholic options. Drinkers get cocktails that glow or have rain forests blooming from their rims, non-drinkers get Sprite in a semi-chilled can.
This year, I advocated for equitable non-alcoholic cocktails be put on the menu at our Christmas party. It worked! We’re getting fancy non-booze this year, because it’s a special occasion and EVERYONE deserves a fancy drink.