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SAN FRANCISCO (AP) -- The sidewalks of downtown San Francisco are crowded with colorful revelers as the city marks its 42nd year celebrating the lesbian, gay and transgender community.

The city already has hosted a weekend of events, including a march in the city's Dolores Park and the so-called "Pink

Saturday" street party. But the biggest one is Sunday's annual gay pride parade.

Organizers say more than 200 floats, vehicles and marching bands are taking part. The city's mayor, Ed Lee, also will address the crowd at the city's Civic Center.

Organizers say San Francisco's events are the largest LGBT gathering in the nation.

Thousands of attendees are also celebrating in Chicago and New York City, where parade-goers are toasting the state's anniversary of its same-sex marriage law.