Do you see your interests in playwriting and history as separate, or are you interested in crossover fields like Public History? There are more grad programs than undergrad ones in this field, but undergrad opportunities do exist, and might dovetail really well with your writing and performing arts interests.
For example, Tsbna already mentioned DePaul on the Playwriting side of things; they also have a Public History concentration within the History BA. What makes a double-major less viable here, though, is the fact that the Playwriting degree is a BFA.
Another, somewhat similar school to look at is Loyola Marymount. The Theater Arts department offers both BA and BFA programs, and playwriting is one of the concentration areas offered. Program - Loyola Marymount University The History department offers a concentration in Applied & Public History. History Concentrations - Loyola Marymount University . It may be possible to blend the two BA programs and cover the bases of your interests nicely, while also taking advantage of the school’s extensive entertainment industry connections in Los Angeles. (Those connections make all related programs competitive to get into, but your background may make you a strong candidate.)
You might find more ideas here, if the idea of a public history program is interesting to you.