WASHINGTON — Bound for the Lincoln Memorial, thousands of demonstrators ambled block after block through the city, shouting obscenities, their faces streaked with sweat and clown paint.

The marchers, known as Juggalos — the tightknit supporters of the rap-metal duo Insane Clown Posse — had descended on the capital to proclaim their right to free speech and to denounce their classification by the F.B.I. as a criminal gang.

But Washingtonians had nothing to fear. In fact, they barely blinked. It was just another day in the capital’s summer of protest.

On Saturday alone, in addition to the Juggalo gathering, there was the Mother of All Rallies — an exhortation to the red-cap-wearing faithful to “take our country back” — and, blocks away, a counterprotest opposing white supremacy. Near the White House, there was a protest against Russia’s election interference. In all, more than 30 events were booked on federal land in the city.