A while ago, I wrote a post suggesting a way of garnering support for using local actors rather than imports. I created a website for SLAW where people could brainstorm. I was thinking about slightly different approach using the same "tear a page out of your program" approach. These can be used for other issues than imported actors, too.
This one involves the same target: a theatre that is importing actors, but is also employing some locals as well. Instead of creating a flyer addressing the issue directly, stand outside of the theatre and distribute a flyer with information about the actors in the play who are locals. Perhaps include their bio's, other shows they've done in Chicago, perhaps quotes from reviews for their previous shows, maybe a brief interview. And then suggest that the spectators show their support for those actors by tearing out the program page with their bio and leaving it in the aisle. So instead of seeming to attack a theatre for importing actors, you are instead applauding them for using locals.
You could do the same thing when a theatre offers a production of a world premiere by an American dramatist. Perhaps distribute a flyer about how infrequent this is happening around the country (you could use the information I published here as a starting point if you like), applaud the theatre for doing it, and suggest that they -- yes, you guessed it -- tear out the playwright bio and leave it in the aisle to show approval.
The SLAW idea got a lot of positive notice when I first proposed it, but there has been no activity on the wiki and no indication of anybody wanting to try it out. So I will make this offer: if you are willing to distribute the flyers, I will write it for you (after you give me the information about the specific situation). Email me if you like: walt eight two eight at gmail dot com. (I actually don't know why you're supposed to write it out, but I've noticed others have done this elsewhere, so it must have something to do with spam or something, right?)