My guess is that OP is going to be in a circus performance (which explains the large tent with air conditioning). As to the reason they don't want to poop, it might be because:
- their costume(s) are difficult to remove
- there is something about the bathroom that they find creepy/unsettling
- they have an STD or other infection in that area of their body and don't want to risk having anyone find out unexpectedly, or don't want to risk spreading it to others via the toilet seat (gonna be real idk if thats even a thing but it feels like it could be)
- they hold some kind of superstition about pooping during the initial travel period, or about entering the bathroom, or something that is in the bathroom
- they have to get to the bathroom by passing an area and/or person that they dislike and/or feel uncomfortable around
- they take notoriously large shits and don't want to clog the toilet
- they just have really bad poop anxiety
Anyway, best of luck to you OP. Hope whatever you're doing works out and that you stay as safe as you can. Update us when you come back!