September Baby Shower

Noelle
My mother in law is throwing me a baby shower, she said September and I'm due October 22. Seems kinda close to my due date and I'd prefer to have everything we need incase the baby comes early. I'm a planner lol I've already started buying stuff off our baby registry. I have a feeling they want to do it in September because my sister is having her baby early August. Is it rude of me if I ask her to have it in August? We are planning it together.