"It is a good time for a great cause," said State Senator, Scott Wiener, who has been a regular at the Oscars party for 20 years, which has helped the Academy raise almost $8.9 million.
OSCARS 2019: See full list of 91st Academy Awards winners
"It raises so much money to help people living with HIV and to help people who are negative, stay negative," said Wiener.
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This year's theme was a sequin-filled version of 'under the sea,' complete with Neptune himself and fabulous dancing fish.
Drag Queen, Kylie Minono, spared no time, turning her drag persona into a mermaid.
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"Starting to out the doors, it's a couple hours," said Minono who wore a teal wig and matching makeup, complete with rhinestones and fish scales.
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In true San Francisco form, some used their look to make a statement about more than just fashion.
"I was inspired by our consumerism," said C.B. Potter, who made his bespoke gown out of his own trash. "It would be a great fantasy for us to live in a world without trash in the ocean."
And San Francisco resident, Monica Smith, proved that vintage glam can be for bargain hunters.
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"It's a great find. I got it at a garage sale, a local garage sale," exclaimed Smith, as she twirled around in her black and gold paillette gown, complete with a built-in cape, that cost $25.
Check out more stories and video about the Oscars.