From the site:
Get your green thumb and garden beds ready for the seventh annual DC State Fair with a Seed Share on Saturday, May 21! Gardeners will be at Eastern Market (225 7th St. SE) between 9 a.m. and 2 p.m. to give away free seeds of all sorts (including flowers, vegetables and cannabis) and to answer all your gardening questions.
Event link: https://dcstatefair.org/2016/05/08/seed-share/