In To Kill a Mockingbird, how does Aunt Alexandra involve herself in Maycomb's social life?

One of the main ways Aunt Alexandra gets involved in the Maycomb social life is by being a part of the Missionary Circle meetings.  The one the reader sees in the book is hosted by Aunt Alexandra at the Finches' house.  The ladies of the church get together for tea and snack in order to discuss the good they can do for the church.  In addition to that, they are also sharp social critics and harsh gossips, commenting mostly on the state of the black population in Maycomb and the outcome of the Tom Robinson trial.