Wig calls

Non-PRO FVA Not for points Homework / test English to Spanish Art/Literary Art, Arts & Crafts, Painting Theater, ballet

Hi, I've been looking for this phrase and I can't find it anywhere!
I'm translating a contract (for academic purposes, no problem with confidentiality) about ballet and it says:

"COSTUME FITTINGS, WIG CALLS AND PHOTOGRAPHIC CALLS
All costume fittings and photographic calls shall be compensated at the A1 Rate (Straight Time Rate). Wig calls shall also be compensated at the A1 Rate (Straight Time Rate)."

I assume "wig calls" is something similar to the costume fittings but with wigs or hairstyles for the show (?).
Does anyone know what's it about? And, maybe, how do they call it in spanish?

Thank you,
Andrea.