Thousands of people at Golden Gate Park for AIDS Walk San Francisco

Sunday was the 33rd annual AIDS Walk San Francisco.

Thousands of people attended the event at Golden Gate Park. 

The walk raises money for those living with HIV and AIDS, as well as research and prevention efforts through dozens of local and national charities.

JFK Drive and many other streets within the park were closed through the day for the event.

The opening ceremony started at 9:45 a.m. at the Robin Williams Meadow before the walk began at 10:30 a.m.

Organizers say the walk has raised more than $90 million since 1987.

This year's event featured celebrities, including actor, Barret Foa of 'NCIS: Los Angeles, and actress and activist Meredith Baxter, who starred in the 1980s comedy classic, 'Family Ties.'