Create Custom Venue
Create a Barista Role - Only Activity: Tend Coffee / Tea Bars and Counters selected.
Add role to the schedule - Starting at 9 am (free time)
Create Visitor Role - Only Activ...
Ideas
I'm having the same issue. I can hire a barista (where you click on the coffee bar and pay $100) and they work fine, but I can't set up a barista with the 'Tend Coffee Bar' task and have them work correctly.
