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Crowd Counting Consortium researchers tallied more than 20,000 separate demonstrations since January 2017, involving 11 to 16 million total participants. sites.google.com/view/crowdcountingconsortium/home
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This method—polling a random sample for their protest participation—gives a better estimate, although one that is inflated somewhat by dishonest self-reporting. washingtonpost.com/news/national/wp/2018/04/06/feature/in-reaction-to-trump-millions-of-americans-are-joining-protests-and-getting-political/?utm_term=.be0779705d27