Stephanie Jacquet, 49, is not an Olympic athlete, nor any kind of athlete at all.

“This is the first time in my life I’ve ever run anything,” she said. Yet there she was in a runner’s bib and a pink tutu past midnight on Saturday, jogging her way through Paris with tens of thousands of other people, cheered on by the crowds as if she were the most decorated of medalists.

The Marathon for All, as it was called, was the final grand flourish of an audacious Summer Games organized around the revolutionary idea that Paris itself could be a stadium, not apart from the sports but at their center. And so, after the end of the official men’s marathon on Saturday, on a route that took the participants from Paris to Versailles and back — the winner was Tamirat Tola of Ethiopia, with a record time of 2:06:26 — Paris hosted a second marathon along the same route, for non-Olympic runners.

And when that was over came a final event: a 10-kilometer race open to anyone from anywhere, athlete or not, as long as they were at least 16, signed up online, and provided a doctor’s note saying they were fit enough to take part. Half were men and half women; they came from 127 countries and went off in waves, the last leaving just before 1 a.m. The oldest runner was 94. And in a nod to the Olympic year, each race had a total of 20,024 entrants.

Felix Vo, 34, who comes from San Diego but lives in Paris, came straight to the 10K race from the Olympic men’s basketball finals, a game won by the United States. “That gave me the energy,” he said after his event, still on a runner’s high.