@Richard2751 If you are certain the rules are to be broken and a party will ensue then you should
a) message the guest asking if they are planning a party
b) remind the guest that parties are not allowed and that the reservation will be canceled if one starts
c) contact Airbnb and warn them that a party is likely
d) ask Airbnb to cancel the reservation if the guest seems to be carrying on with their party plans
e) evict the guest (that's the difficult bit)
f) accept you will have to partially refund the guest
g) accept that you will get a bad review BUT Airbnb should delete it based on there policies
Just one thought - Could the guest be taking the party gear elsewhere??????