Unfortunately all you really have is just hope it doesn't happen.
Thankfully JPSO did not allow protesters onto the overhead on several occasions. There was some in the roadway BS on the surface streets but not for too long.
Problem is I live in Orleans Parish! They will just let it happen like they shut down the crescent city connection from 6pm-11pm and the police just stood there the whole time, finally using gas and rubber bullets late in the evening when the protestors showed they wanted more than just "free speech"