Festivals and Parades

Check out your local festivals and parades. There are a bunch that celebrate specific races and ethnicities. It's a free, cheap way to have fun, and have an educational experience. It's also a great opportunity to meet new people.

Cultural Themes

An educational and fun theme that's also kid-friendly is designating a cultural theme in a specific room or wall. When my friend bought a three-bedroom house, he selected an African, Hispanic, and Asian theme for every room. You can even create a menu based on a cultural theme. Maybe invite friends over once a month, and everyone brings a dish from the selected region. You can do this once a month or once a week according to your preference.