Tieflings party at camp

[mihanu]

Once I defeat the goblin leader, do the tieflings stay with the druids by the time I show up or do they disappear after x amount of long rests?

[MachineGod]

They waitin to party with you bruh don’t leave them hanging

[AnonymousWizard]

From what I can tell they'll wait for you to return to the grove but then join your next long rest whenever you start it. So you can, if you want, run around doing the other side quests first.

[Wokelander]

They hold the world's lamest party in your camp and then bugger off to get plot-deviced again down the road, will trigger on next long rest or possibly just camp visit, I forget which