Where is the sign up booth for Trials of the Jedi at?
Indiana Jones Adventure Outpost.
In mde, if you search for it, it shows you the stage where they do the battles, not the sign up, but if you blow the map up, look at the building next to 50’s Prime Time that’s on the Indiana Jones Theater side. That’s the Outpost.
Also, any cm will be able to point you in the right direction.
You MUST be there at rope drop and go straight there first left - otherwise you don’t stand a chance. It means foregoing a ride at rd but that’s the price. Josh at easywdw.com has a good strategy for it.