I continue to be amazed at how people think even when it is really cold outside that they can have an outdoor party and expect their entertainer to remain outside in the cold, windy weather for four to five hours at a time. Are we not human? Sure the party guests can go inside and outside as they please, but the entertainer has to stay wherever the DJ booth is set up.
Other things to consider when planning a party. If you are playing loud music outside there are other people to consider....your neighbors. Sure you think they don't care, but when you want loud music, they may not. If they complain and call the cops, you are forced to either turn the music down or even off. The police do have the authority to shut your party down completely and it has happened. Also it would be good measure to know the sound ordinances for your location, because it is your party, you are responsible for the legalities of it all.
Many times it makes more sense to rent a venue for the evening and eliminate all of these issues. There are venues out there that are extremely affordable if you check around. You can have a real dance floor and plenty of room for everyone and decorate to your heart's content. And the great part about having a party somewhere other than your home is not worrying about your guests tearing up your house or stealing your stuff when you are not looking.