As reported by Washington Gardener (a sponsor of the event), Sunday March 28th at the Historical Society of DC (2pm) the DC Family Urban Gardening Series will host a FREE lecture on forgotten annuals (lovelies such as cosmos, nasturtiums, columbines, etc.) and how to start them from seed, followed by a seed swap.
This sounds like a fabulous event and I'm very disappointed I already have plans for Sunday. I attended this lecture series last year and it was fantastic, so I encourage you to attend!
For more information, check out the Washington Gardener's blog page.