The former Beatle and rock legend is playing an outdoor show at the stadium Wednesday night.
McCartney has long been known as a staunch vegan and a vehement supporter of animal rights.
He even travelled with his then-wife Heather Mills to northern Canada to protest seal hunting practices in 2006.
As part of the deal to bring McCartney to Regina, everyone working on the staging for the show is getting a taste of how he lives.
Evraz Place vice-president Neil Donnelly says that means the workers are being served vegetarian meals.
"I think the bigger you get the more you want things done your way," Donnelly says. "So if it means travelling with your own folks to take care of that, they can do that."
Donnelly says so far the workers have enjoyed the meals.
"Obviously there's a few jokes flying around about people ordering pizza," he laughs.
McCartney played Winnipeg on Monday night and his Regina show is his last until November.