You don’t necessarily need to get a brand new guild together in order to form a troupe. It could be something as simple as a small group of five people who want to play out a particular story. Also, a pre-scheduled “bar night” in your faction’s capital can be considered part of a troupe, especially if you set up certain ground rules about how things “work” in that tavern.
All the World’s a Stage: Forming a roleplay troupe