Maxperson
Morkus from Orkus
I can improvise well enough that even if I don't have something else prepared, I can wing it through the night and prep whatever else it is that they want to do before they get there.I was posing it to the group.
Of course I allow them to go to the tavern and then devise a way to organically encourage them to head back to the catacombs (basically, I railroad them). I can't remember a time in 40 years that hasn't worked.
If I prepared for a session in the catacombs (hypothetically), then that's where they'll go. I'm pretty good at it, too, so they enjoy it. I'm never directly confrontory and never verbally stop them from going off the rails. I don't know any decent DMs who do that -- simply break the fourth wall and order players to stop and get back on track. Honestly, does anyone do that?
I could improvise something else in a game, but I roleplay better when I've prepared for it (i.e. the catacombs).
Not always, but fairly often, they will at some point get FOMO and go back anyway to see what they missed.