The event ended with a cruise through the area where Walker and his friend Roger Rodas died last month.
Fans, friends and car enthusiasts flocked to the Los Angeles suburb of Santa Clarita for a memorial to Walker which had been planned through social media.
Long queues of tuned sports cars stretched for miles, while mourners left flowers, candles, stuffed animals and other tributes.
The event concluded on Sunday evening with a cruise through the area where Walker and his friend Roger Rodas died on November 30, around 30 miles northwest of central Los Angeles.
Los Angeles County sheriff’s department said on its Twitter feed that some illegally parked cars had to be towed.
Among those at the memorial was Edi Maya, a gardener who worked in Walker’s neighbourhood and said he chatted with the actor from time to time. “I work next to his house every week, twice a week. Seeing those candles there, it’s heartbreaking,” he told KABC-TV.
Walker, 40, was killed when the Porsche Carrera GT he was a passenger in smashed into a lamp post and tree before bursting into flames.
Rodas, the actor’s friend and financial adviser, who was driving, also died. Authorities say speed was a factor in the crash.
The limited-edition Porsche was previously owned by IndyCar driver Graham Rahal, who said it could be difficult to drive.
The two had bonded over a passion for fast cars. They co-owned an auto racing team named after Rodas’ custom car shop, Always Evolving.
Rodas, 38, drove professionally for the team on the Pirelli World Challenge circuit this year.
Walker, the star of five of the six Fast & Furious movies, was the face of the franchise. He was making the seventh film in the series when he died.
Universal Pictures has shut down production while it decides how it might proceed without him.