Fans brought their own hand-made posters, and many carried copies of the second book in the series by Suzanne Collins.
Danny Hernandez of Azusa, California, was among those with book (and Sharpie) in hand. He applied for the fan camp so he might get a chance to see the film early, but found connecting with fellow fans even more rewarding.
"The coolest thing was meeting all of these people," the 29-year-old said, adding that he had come alone but now belonged to a group of 10, who planned to watch the film together.
Cheyenne Deen of Las Vegas convinced her mom and sister to travel to Los Angeles for the camping adventure. The 22-year-old and her friend, 19-year-old Michelle Mota, came to the first "Hunger Games" fan camp and also slept on the sidewalk for the "Twilight" premieres.
They have a tip for fan-camp folks: "Never leave the camp because there's always something going on."
The two participated in a scavenger hunt and collected autographs from Hutcherson and others.
Deen's mother, Elaine, who'd never attended a fan camp before, was dazzled to near speechlessness.
"I'm star-struck," she said.
"The Hunger Games: Catching Fire" opens Friday.
___
Follow AP Entertainment Writer Sandy Cohen at www.twitter.com/APSandy .