7-8 p.m. – The Upper Chattahoochee Riverkeeper presents a rain barrel workshop. Learn how to divert rain water from your roof into a 55-gallon barrel to use in plant watering, car washing, etc. $35; reservations necessary. Remember to bring a vehicle capable of carrying a 55-gallon container home. Contact Linda Shulin at 678.725.1099 for details. St. Luke’s Presbyterian Church, 1978 Mt. Vernon Rd., Dunwoody, GA 30338.