If you are planning a wedding, you want it to be as luxurious as it can be for your guests. If the event is at a private home/farm, you also want to protect your home from the people who are invited. Your home will already be in disarray with people going in and out. Having a nice place for guests to use the restroom eliminates that many more people are going into your home. It also gives you peace of mind that people won't be walking through your house looking for the bathroom.