Baby shower delimma

Our baby shower is this Saturday at our neighborhood park, my husbands sisters are throwing it for us. We have to have it early due to my short cervix and preterm labor which is a huge possibly so we just want to get everything ready in case our son does make it before his due date. Anyways I looked up the weather and it changed to rain and in the 50s so now I don't know if we should move it in our apt which I don't want to. I have no idea