How to get the circus troupe merchant to show up?

I'm trying to round out my early game Gwent deck. According to multiple sources, there should be a Circus troupe encampment northwest of Carsten, west of the Vegelbud estate. There I want to find this merchant who sells multiple cards. However, when I go there the area is completely empty.

Does the camp only appear later in the game, or during a particular quest? Or is there some other condition to unlocking him?

I have the Steam GOTY edition with all DLCs installed.

Solution 1:

Starting the "Open Sesame! Breaking and Entering" quest (part of Hearts of Stone) will make the troupe appear. I'm not sure if there are any other ways to get it.