The trouble with having people round, is that some just don't know when to leave. Here's how to get them out of the house without causing a scene. First, subtly taper off the entertainment. Gather glasses and bottles and put away any remaining food.
Start loading the dishwasher. Yawn and say, "Honey, we should really go to sleep. These people want to get going."
Openly start using cleaning products. Ask them to help by taking out the rubbish, or failing that, going out and getting in their car.