A convoy of Lamborghinis carried many of the people who helped grant the wish of 5-year-old cancer patient Miles Scott, who wanted to be Batkid.
Red carpet arrivals for "Batkid Begins: The Wish Heard Around the World" started at Sundance Kabuki Cinema on Post Street around 6 p.m.
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Miles remains in remission and just finished first grade.
The documentary will open in select theaters Friday.
Actor Ben Affleck tweeted his support on Wednesday morning. He wrote, "From one Batman to another: thank you #SFBatkid."
Click here for information on how to make a child's wish come true, and click here for full coverage on Batkid.