It's a concert staple that's lured young music lovers for 19 years.
Some fans even call it, "the best day ever!"
New Zealand's Gin Wigmore is one of the dozens of artists who performed on nine stages during the tour that kicks off a 40-date schedule in Auburn.
The bands range from up and comers to established artists.
From harder to softer sounds.
The band Never Shout Never says the lengthy line up lets kids explore new bands.
"It's a great way to get new fans, all these kids come for all different kinds of music so if they catch your set maybe they liked what they heard," a member of the band said.
The bottom line is that most artists agree, this is about music, friends, and fun.
Gabe Barham Sleeping with Sirens: "We pulled in at 10 a.m. and crawled out and here's all our friends just climbing on the bus."
"You can't compare this to a large festival or a three-day festival," Zac Eisenstein, of Man Overboard said. "This is an entry-level festival. These are for the 13 and 14 year old kids it's a good environment for them."
They even have reverse day care for kids to drop off their parents at an air conditioned tent during the day.
Music, sun, and fun for everyone?
Organizers say who needs more convincing than that.
The tour is in Portland on Sunday.