This frothy blend of rum, beer, and citrus came to Baldur's Gate with the dwarven diaspora moving from the mountains to the city. A traditional dwarven drink beloved for its golden hue, it feels like a bucket of sunshine in the dingy dark of the underground world, and its popularity has not waned in the new aboveground grayness of the city.
Celebration Brew is not tied to any specific event in dwarven culture. On the contrary, dwarves will order this drink to commemorate anything at all. Discovered a new gold deposit? That's cause for a celebration! Had a new baby? That's cause for a celebration! Lost a shoe? That's cause for a celebration!
The drink is also known as Liquid Courage because there are times when everything is grim and hope is hard to come by. On occasions when there is nothing to celebrate, well, that's when you need some liquid courage to get you through. Any other circumstances? Cause for a celebration!