There was a report on this in the Milwaukee Journal over the past couple of days. On Thursday night (opening night) a group of unsupervised teenage hoodlums first started fights among themselves for whatever reason, then as the park was closing started attacking other fairgoers. On the surface, the later attacks appear to be race-related as known victims were white and the thugs were all African-Americans. About 30 arrests were made, and new rules for attendees of the fair were put into place, most notably no unsupervised minors under the age of 18, with ID checks in place.
There were no incidents on either Friday or Saturday.

I do have to commend you on not stooping to the Business Insider’s headline proclaiming it to be a “Race War”.

businessinsider.com

Apparently they’ve got Stormfront bloggers writing their news stories now.
(The blatantly white supremacist comments to the article - actually espousing the Neo-Nazi “American Third Position” don’t help matters either).