If the house is a two-story, you can keep your guests on the main floor by using a strip of that yellow and black tape we got from Get Famous. Lock the computers if you have Uni, so that the guests aren't just free to use them, or better still lock the door to the computer room altogether. If you wish to serve drinks, use the Globe Bar to pour a platter of drinks, then click on the edge of the platter and you can call them to take a drink. Parties are really difficult. Mostly I stick with a Kegger the night before Uni graduation. Hope my suggestions help a bit.