Open House and Master Gardener Plant Swap and Sale. The swap and sale takes place from 10 a.m. to 12 p.m., along with soil testing, plant identification, and horticultural questions answered by Master Gardener Volunteers. Open house highlights include: 4-H farm animals and pets, archery, DIY birdfeeders and trail mix, educational exhibits and displays, food, music and more. Rain or shine. Information at www.ccecolumbiagreene.org.