Can I bring chairs on the grass for tonight’s chris you go concert? There’s is no one answering the phone so I don’t know if I can bring a chair. Does anyone have a number I can call?

Yes.

They don't. They have a list on this site of what is and isn't allowed. https://www.livenationvenue.com/mattress-firm-amphitheatre

They do not allow chair into the venue

They rent chairs there, so the answer could possibly be no.

Last time I been there they dont allow us to enter with an umbrella, so I believe the answer is no, they get very picky about what goes in and what not. Hope it helps you out