The Blackmarket Pub Crawl is an unmarked quest found in the Dragon's Kneecap Tavern in the Guildrow district of the Blackmarket.

How to start the quest

To start the quest you must go to the Dragon's Kneecap and order an Icewraith Brew, from there you must drink two local northern ales in the Dragon's Kneecap.

Then leave and head to Blackrow and enter the Blackrow Tavern, here you will drink two local northern ales, then you must depart for the fighter's distrct into the Pitside tavern for the final two local northern ales, where you will be greeted by a new screen with an applause sound effect played and the mini quest complete.

Here's a poster for the Pub Crawl found in the Dragon's Kneecap

And an alternate poster if Goblins are banned in the Blackmarket.

Trivia

The quest can be redone infinitely and was added to the game as a joke.