That's a pretty specific context, and only someone in that profession would understand what "block" means. The example you gave sounds like instructions given to staff working on a theatrical production or something similar. In that context, I would guess that "block" means "to get them ready to be used and put them where the actors(?) expect to find them."

I'm a native english speaker and I don't understand those sentences either. But perhaps they mean "put the wig on a block", like this: http://www.makeup-fx.com/webshop/nail_wig.html

"To block" means to stop or prevent your opponent from doing something.