Right now the most important things for your guests to know are who, what, when and where. The Perrier Group of America in Greenwich, Conn., suggested the telephone is a perfectly good method if you're short on time, if you're throwing a casual party, or if it is a small gathering. Written invitations can be either your own, using personal stationary, or some inexpensive note cards. A party theme is up to you. Other international themes work in a similar way.
Organized entertainment can be as simple as games, games, games.
Just make sure you pick games that your guests will be comfortable with, avoiding anything that might cause embarrassment to anyone. Remember, conversation itself is a form of entertainment that generally takes care of itself. If your party is to be a success, you'll need to create a visually appealing look. Lighting is one key element in this look. Replace your light bulbs with colored ones, and use candles for additional ambience.