Things have been brewing for quite a bit longer than a year, but that's not the point at least I'm trying to make. Organization has started (atleast based on news coverage around here) only now when things are really getting out of control. There was time, there was easier options but from now on it's going to be more and more difficult, specially if orange toddler actually manages to stall midterm elections. So, due to the circumstances, the time is essential, and (again, based on news coverage and other limited info I have) there's quite a few people, to put it bluntly, just talking that someone should do something, while wery little actually gets done.
I am from Finland and while our communities are fairly small I can understand how it takes longer to organize bigger masses, but the whole humanity is still pretty much just 6 handshakes away from eachother. As a member of local council I've at least tried to change local politics and from experience I can say that it takes an afternoon or two to individually call trough ~20 politically active people and organize something. Those 20 people can then each call to their contacts and (assuming there's no overlap) just from those two steps of "pyramid" and few days you can get 400 individuals on board or at least informed what's coming up. 3rd "step" totals to 8400 people, 4th 160k and from there the number is in millions.
Obviously things in real world don't work quite like pure calculations, but with a pretty low precentage of active individuals it's still absolutely possible to reach out meaningful portion of the whole country within a few months.