Treat your residents to some good old comfort food and create an environment where they can't help but mingle with their neighbors. You could partner with a local bakery to get cookie donations in exchange for free marketing, or make them yourself.
It's all about the presentation. Box or package your cookies in a fun way, display them on a beautiful tray, or use a chalkboard to identify the kinds of cookies. For your milk, use real glassware, or serve it up in old-fashioned milk bottles with paper straws. We found some on Amazon for about $1 each or we've seen them at the Target Dollar Spot!