Facebook users reported the event for militia group, Kenosha Guard, 455 times for violating rules around the incitement of violence. The event asked attendees to bring weapons. Facebook moderators said the event didn't violate any rules. https://www.buzzfeednews.com/article/ryanmac/kenosha-militia-facebook-reported-455-times-moderators

For perspective the Kenosha Guard event made up 66% of all event reports for the day according to an internal report seen by BuzzFeed News. The Guard and event pages were only taken down several hours after 2 protestors were killed by a 17-year-old gunman. https://www.buzzfeednews.com/article/ryanmac/kenosha-militia-facebook-reported-455-times-moderators

From FB's report:

“This post provides more details around what happened and changes we are making to detect and investigate similar events sooner. This is a sobering reminder of the importance of the work we do, especially during this charged period.” https://www.buzzfeednews.com/article/ryanmac/kenosha-militia-facebook-reported-455-times-moderators