Another suggestion is to keep an eye on the College of Southern Maryland Events web site. We took the Bug to see The Secret Garden last weekend up in La Plata. I have also taken her there to see Goldilocks and the Three Bears, Legend of Sleepy Hollow, and the short version of the Nutcracker.
I have taken her to DC to see the regular version of the Nutcrakcer as well as Peter Pan (PFGal and chicklet joined us for that one) both performed by the Washington Ballet. (I know, to girly for you guys...)