Some people might not realize that when having a party there is the potential for creating an infestation. Depending on the type and size of party, your door can be opening and closing over a hundred times in one night, giving insects many more chances than usual to enter your home. 
A good idea is to keep screen doors and try and limit the amount of times people are going in and out. Another practical way is to get insect repelling candles to put right outside entrances to the house. This way you can enjoy your company without having to wake up the next day with a new infestation!