Like most others, I didn't receive any theatre-specific scholarships aside from those directly from my department. My best advice would be to think of all of the various skills you have acquired through stage managing and find scholarships that are looking for those qualities (organization, leadership, community-minded, service oriented, etc). Also, make sure you've exhausted the local scholarship scene, especially if you have done community theatre or something of the sort where you can talk about how you've directly impacted the local community by presenting live performing art to the population (Especially note if you've done this for an underserved population). Anything like that that you can emphasize some kind of serving quality is good.
Also, as they have said above- definitely focus on academic scholarships if you can.
Good luck!