Getting the Cheery Man to agree
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From: Preparing for a Lethal Gambit (Last Constable)
"His participation is rather required if we're going to end this."
Unlocked with 
The Cheery Man and the Last Constable: Favouring the Constable
Locked with 
Summoning the Opponent
Success
A social call
"The old rogue's been waiting for this, mark my words. He's easy to find. He'll be in his fetid watering hole in Watchmaker's."
Find the other party at their usual haunt and invite them to the game. (Sets 
Summoning the Opponent to 1)
