According to a post on the forums, the studio will be "making a concerted effort" to combat trolls and encourage the continuation of player-run events. GMs pledged to take action on help tickets as well as monitor such events as they occur, but said that it will limit such policing efforts to stage areas only.
"We know that players moving throughout the performance area on mounts can be particularly frustrating and distracting," the studio said. "To combat this problem we're looking into what options are available to help combat this behavior in designated performance (stage) areas. We'll also be removing players who are mounted from the stage area manually in the meantime."
[Thanks to George for the tip!]