Allow the gambling den's owner to set up a private game
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From: The Tower of Sparrows: Vice and Virtue in a Gambling Den
You're not using the place. Why not.
Game Instructions: This will make this card no longer appear in your Opportunity Deck. You can retrieve it at any time by using the Key to your rooms above a Gambling Den from your inventory.
Unlocked with 
Living Elsewhere is "you currently reside elsewhere"
Success
A deal
The gambling den's owner has a large card table brought up. "It's a good thing," she notes. "Some of the patrons were wary of being seen."
You have loaned out your rooms above a gambling den. (Sets 
Loaned Out your Rooms Above a Gambling Den to 1)
