When do you need a permit? Protests of 25 people or more on the National Mall or other National Park Service operated spaces in DC require a permit (
click here to see a listing of those spaces) require a permit, as does any event that requires streets to be closed. The Metropolitan Police, because they lost an important court case, are required to allow permit-less marches in the street as long as they stay within a single lane. Demonstrations on public sidewalks are legally permissable without a permit so long as they don’t block the walkway and fewer than 100 people are expected.