I can't speak for events that haven't happened yet or for every city but based on my own experience and everything I saw earlier this year, the #NoKings protests are a really accessible entry into protesting.
It's a really fun crowd, felt super safe, and there was safety in numbers.
When history books are talking about it you can proudly say "I marched".
It's hard to say whether it led to material policy changes but a massive presence is a loud statement.
https://vmst.io/@jalefkowit/115391036837219836