Crowd Removed With Chemical Spray As MN State Fair Closed https://t.co/T1Px9uWGeA pic.twitter.com/okxzcaDFtM

— WCCO - CBS Minnesota (@WCCO) September 7, 2021

All the news articles I’ve found have been very careful not to explicitly state the why but a few mention a “Ramsey County judge recently rejected a request by a gun owners group for a temporary injunction to require State Fair officials to allow permit holders to carry their weapons on the fairgrounds.”