The Medieval Play 'Herod's Killing of the Children', directed by Elisabeth Dutton, on the Medieval Convent Drama project. This is the only Middle English play-script to survive outside of a convent which features clear and definite indication that female actors performed onstage.
For interested readers you can find it in: The Late Medieval Religious Plays of Bodleian Manuscripts Digby 133 and e Museo 160, ed. Baker, Murphy and Hall Jr, EETS n. s. 283 (London, 1982). Feel free to come along, and do pass on.