A friend whom I have known for many years, Evelyn Bence has written a thoughtful article about an institution that we take for granted in the church, the pot luck dinner or supper. I highly recommend her posting.
http://www.buildfaith.org/2015/10/21/why-church-potlucks-are-here-to-stay/
Evelyn is an accomplished author with a recent book called Room at My Table: Preparing Heart and Home for Christian Hospitality (Upper Room Books).
Some churches hold Pot luck dinners regularly. Others host them only occasionally. Some are more tightly organized than others. But I my experience, they are always great times to get to know other people and celebrate the common bonds that we enjoy.