This year there are changes and new rules, and an unexpected performer cancellation.
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"We're ready to party," said Mimi Drewniany.
Mimi and Michael from San Carlos almost forgot what a rock concert was.
"I'm so excited, this is a coming out party for everyone right," said Michael Drewniny.
Organizers say the three-day weekend concert is sold out.
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There are new rules this year -- Proof of vaccination or a negative COVID test is required for entry at the gate.
"Everybody's vaccinated, they seem to be taking the right precautions, so I feel good about it," said Jermaine Baldwin from Oakland.
And lots of big names are on the lineup, everybody's got their favs.
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But on Friday, country music star Chris Stapleton tweeted he was unable to perform at BottleRock Friday evening, due to a non-COVID related illness. Fans were bummed.
"I'm disappointed, I've got my cowboy boots on, now I don't know what to do for the evening," said Joanne Humphrey from Santa Rosa.
There's always the food, 87 wine and food vendors are there.
Artists like Miley Cyrus, Foo Fighters, G-Eazy, Megan Thee Stallion and Guns N Roses are scheduled to perform.