Hello!
Neither of Brogendenstein's taverns, Rhek's in the Golden Halls or the player-owned Hearthhouse by the docks, have dartboards. The Hearthhouse does sell darts, which makes me think a dartboard was intended to be there at some point.
Adding a dartboard to one or both of the taverns would be appreciated by some. I imagine it is a lightweight change to implement. The darts are a fun little mini-game amid social RP, and I'm sure dwarves & company would be fond of bar games.
Thanks for your time.