>>96077925
This is literally how I'm running my current game, in which the PCs are men-of-leisure in turn of the century England hunting monsters and occult mysteries. They're part of a society that has monthly meetings, but other than that, how they spend their time and where they go has been entirely up to them. I'll furnish them with potential hooks, different things going on in different characters' narratives, and they get together and organize expeditions. Like just recently, one of the party has been sitting on a letter from a dead granddad promising him an inheritance he never got, so he got his fellows together and went to northern Spain to find out for himself, and that ended up turning into a week-long expedition where they got into a shootout with bandits and fought an actual dragon.