The Vegetarian Society of East Tennessee holds a cooking demonstration followed by a potluck supper at 6:00 PM at the Tennessee Valley Unitarian Universalist Church, 2931 Kingston Pike, on the first Sunday of every month.
From their site:
Please bring a vegan or vegetarian dish to share. Visitors and guests are always welcome. There is a small fee to help offset the room rental: $2 for members and $3 for non-members.
They also note that it's helpful for you to write down the ingredients in the dish you bring. This helps those with food sensitivities and vegans with their eating selection.