Photos by Alena Dubavaya/Sarah Brooks, Gentry Lee, @TheSWU

This large-scale public event includes participation by global policymakers, finance ministers, environment and development NGOs, industry executives and others. This year, a large crowd is expected to attend in the nation's capital, and additional marches will be organized around the country.  In the past, the event started at 12 p.m. at the National Mall in Washington, D.C. and moving toward the Capitol beginning at 2 p.m.