Add a new dynastic rule, called Locations:

Each Partygoer has a Location, which may be Pool, Garden, Barbecue, Kitchen or Toilet, and which defaults to Garden. A Partygoer’s Location has no effect unless a Party or Grand Party is currently taking place.

If there is a rule called Pot Luck, change ‘“Soda”, “Meat”, “Chips” or “Brownies”’ to

Soda”, “Meat”, “Chips”, “Brownies”, or “Acoustic Guitar”

If there is a rule called Party Time, add the following to the end of it:

Any Partygoer who is sharing a Location with another Partygoer who is holding an Acoustic Guitar may not score Party Points.