Despite rain, thousands attended annual event
Second annual event concluded with a fireworks show
Grand Marshals included cast of 'Pose'
Mick Aitken was the first to cross the finish line
Headliners Sivan, Cara performed at annual event
Annual march drew thousands
Annual event draws thousands
Honorees included D.C. Mayor Muriel Bowser and transgender activist Gavin Grimm
Carter, Obergefell, Ramirez and Windsor served as Grand Marshalls
Miley Cyrus, Pointer Sisters perform