Wedding after party

Hi we were asked by the wedding couple if they can have the wedding after party at our home. After we replied yes we found out on the invitation that no acholol is allowed. I feel this should of been discussed with us. While we respect their wishes and the event is outside we feel we need to lock the house or pack up our bar area. This leaves quests with no place to go for a bathroom. Also we keep asking how many tables and other questions so we can prepare and we do not get an answer. What is the etiquette for after party ? Should the couple set up?