I use an old bottling bucket. Dropped in the corny, surrounded with ice, and wrapped the whole thing in a towel. The top will be sticking out, but the beer is being drawn from the bottom, so you will still get cold beer. Make sure your serving line is long enough to prevent foaming, and also, try to set the keg up a couple of hours before the party so it will have a chance to settle out any sediment that kicks up due to being moved. Have fun!