What are events that occur in "Goodnight Desdemona, Good Morning Juliet" that have to do with feminism?
The play as a whole, and the development of Constance the protagonist, is a work of satirical feminism in itself. Through absurdity, MacDonald focuses on women's rights and identity, and on men's discrimination towards women. As for specific acts that reveal feminism, look to the scene between Constance and Night, when he is obviously belittling her and has, by consequence of being a man, secured the post she wanted. The audience sees in this scene that Night is the villian and that Constance is the victim, highlighting the problem of equality in today's society.
In the next act, Constance intervenes and is able to reveal to Othello that Iago is tricking him. Through this action, she has put forward the strength of women, and made clear the need for equality that is lacking in Act I.
The scene with the ghost further empowers women by first making it clear that the author of the play and the wise fool are in fact the same "lass" - in other words, a woman and not a man. This revelation begins to connect the actions of Constance, the feminine hero, and will culminate in her return to reality with a golden pen.