Not in your USA. There are multiple USAs it seems. I did No Mow May last year (on just a small part of the yard) and the guy across the street started shouting at me until June (at which point he just started shouting about other things)

I've seen ads for "No mow May" here in the US. I can't imagine there will be much buy-in, but it would be nice to see a change in opinion against lawn culture. I personally would rather keep the lawn relatively short (still taller than most "respectable" homeowners prefer) while allowing the violets and clover to have their place in the mix. The dandelions wouldn't bother me if they didn't get so out of hand so quickly, especially this year. I don't want a dandelion monoculture any more than I want a fescue monoculture. The dog traffic in the back yard is hard on the grass and that just gives the dandelions even more of an edge. Now I'm wondering if I should start seeding clover and other groundcover that's more traffic-tolerant. I just think the dandelions will outcompete even the clover. If anyone has ideas for groundcover that will pop up even earlier, I'm all ears.

I'd very much like to put a border down for a 10' diameter circle out of my front lawn and dump wildflower seeds in there. They e got mixed that kind of come up as each flower's preferred season comes around. I figure if there's a border, that makes it a garden and not weeds even if my neighbors weren't super chill.