Depends on the size of your party, if you've already invested in kegging equipment (if you'll be using it thereafter)/can afford it etc. For me, I keg all my brews. I keep it in an old fridge w/a controller to keep it up to cellar temp. For a party away from home, I've put it in one of those big keg tubs for the commercial kegs. It's a good excuse to get out of bottling if you can afford the investment.
Consider getting a keg of a good craft brew if 5 gallons isn't gonna be enough?