Officials cancel all "No Kings" events in Minnesota following shootings of Rep. Hortman, Sen. Hoffman
Officials cancel all "No Kings" events in Minnesota following shootings of Rep. Hortman, Sen. Hoffman

Thousands attend "No Kings" rally at Minnesota Capitol in wake of targeted shootings

If a protest requires permission it isn’t a protest.
In the US, generally, you aren’t so much asking permission as giving notice that your expecting a generate a crowd, despite the phrasing. Freedoms of speech, assembly and association are still a thing.
The purpose behind it is to give emergency services a heads up to minimize obstruction of normal or emergency traffic and to provide some level of crowd control to minimize the chance of flash stampedes. Like if some idiot sets off a firework, everyone thinks it’s a gunshot and started running.
Approval is generally automatic, but failure to go through the approval process could result in your peaceful protest turning into a riot, or being declared a riot.
They were declared riots before they even started.
Protests turn into riots when the police wanted to, exactly then, and very rarely before that point.