Don't Overdo It
The number one issue we've had is with people who make waaaay too much food. There are four people living in my house right now, and someone recently brought us a dinner of two rotisserie chickens, a meatloaf, plus side dishes and soup. That's three dinners, not one. And when everyone brings enough food for a few days of leftovers, it's easy to be completely overwhelmed. Ask before you cook for an army, and if you know you're not the only person bringing food, try making just enough.