100th class - does it have to be at home studio?

Hi all! I am about to hit 100th class and want to check on sth. In order to get a shirt, do i have to take it at my home studio? My membership allow me to take classes at 3 studios since they are the same owner, so I have been going to the one that has more instructors that I like. So just wondering if I should take 100th class at my home studio or the sister studio that I have been going.