Talk to them when they come in. Show some interest. Get to know them.
Kids want to be treated like an adult, this is one area in which that works.
Food always works. Feed them. Even let them have access to the kitchen.
Do something unexpected from the normal routine. Be a little playful.
This isn't the time to correct your kid. Do that later, where you can discuss.
Names, siblings, & unique things about them. Also, how your kid knows them.
An environment that's void of contention makes a place people want to be.
Give them some room. Not the bedroom. But, some talking space to be private.
Everyone has annoyances. Overlook them. See what your kid sees. Be open.
It doesn't have to be 'open all night' but kids like late nights. Especially weekends.
Everyone wants to belong. Somewhere. Make it you and yours that they think of as 'family' when they need to connect. How you interaction with your kid's friends, and your kid, will benefit everyone.