Protesters hold signs while demonstrating at McPherson Square in Washington, D.C., on Thursday, Jan. 19, 2017.

A weekend of protests over the inauguration and presidency of Donald Trump began Thursday night with police in Washington, D.C., using pepper spray on protesters demonstrating outside a pro-Trump event.

Hundreds rallied outside the National Press Club, where the event billed as DeploraBall, was being held, NBC Washington reported. Some demonstrators set off smoke devices in the middle of the crowd, and police in riot gear blocked entrance to the dinner.