When it comes to entertaining, I really embrace the whole "the more the merrier" thing, but that philosophy does not extend to dishes. To cut down on the amount of sudsy labour I'll have to do after guests leave, I'll be using The Kitchn's "one person = one drinking vessel" rule. Photo by Rachel Fox.
My family has actually been doing (well, trying to do) this for years at our holiday gatherings. I have five aunts and uncles (plus their spouses) and 14 first cousins, and we do a lot of drinking out of cups. Assigning each member of the family one coffee mug and one drinking glass means they have to rinse it if they want to fill it with something else, and cuts down on the number of dishes the host has to deal with. If all of your drinking vessels look the same, consider getting some wine charms or using washi tape to label. That way nobody can pin their dirty cup on anyone else.
The Easiest Way to Do Fewer Dishes [Apartment Therapy]