There is solution, it requires some metagaming informations tho. O_o
Usualy only my Tav was locked inside, others stayed out ...
So you can either go to secret passage and get antoher circlet from that Halfling person.
Or maybe your team members would be able to travel to camp through waypoint (just guesing, i never tryed)
I still dont understand why cant we change Race for our hirelings.

Lets us play Githyanki as racist as they trully are!