NEW YORK — Celebration and pride mixed with defiance in New York City on Sunday as throngs of people crowded the streets, rainbow flags waving, for the annual gay pride march.

Tennis legend Billie Jean King was one of the grand marshals, along with transgender advocate Tyler Ford and civil rights group Lambda Legal.

The event, and others like it around the country, commemorated the riots that erupted in response to a police raid at a New York gay bar called the Stonewall Inn in June 1969.

Onlookers and participants in New York noted those origins at Sunday’s event, which was both a celebration of the diversity of LGBT culture and a statement against anti-LGBT policies promoted by President Trump, such as the Republican president’s attempt to ban all transgender people from serving in the military.

Elected officials, including New York Governor Andrew Cuomo and New York City Mayor Bill de Blasio, both Democrats, were among those attending the march.

Before it started, Cuomo officially unveiled a New York state memorial to lesbian, gay, bisexual, and transgender people that honors victims of intolerance. Placed in Hudson River Park, it has nine boulders with pieces of glass installed in them that can act as prisms and reflect rainbows in sunlight.

Cuomo formed the commission to come up with an LGBT memorial after the Pulse nightclub shooting in Orlando that left 49 people dead.

Parade spectators also spoke out against policies aimed at other communities, like immigrants and minorities.

‘‘We’re making a statement that we’re here, everybody. Whether it’s immigrants, whether it’s queer people, or people of color, we’re not going to put up with what this administration is doing,’’ said Diego Molano, of Queens, at his second pride parade. ‘‘You can’t just cage everybody up.’’

Olivia Nadler, a Connecticut resident attending her third parade, said, ‘‘People that are oppressed are not going to go away, they’re not going to be quiet, they’re not going to be ignored.’’

Among the signs people were carrying in the parade were phrases like, ‘‘Black and brown and trans lives matter’’ and ‘‘No more guns.’’

Ohemaa Dixon, 20, from Brooklyn, teared up as she spoke about what the parade meant to her and the joy she felt in seeing everyone come out to attend.

‘‘It’s OK to be who you are and love who you love and dress how you want to dress and do what you want to do because I think it’s so important to be who you are and who you love,’’ she said.

‘‘I’m getting emotional about it because I think it’s so beautiful when people are who they are,’’ Dixon said. “That’s why I love coming to these things. I think it’s really cool that people come and they are exactly who they want to be.’’

Associated Press