Antifa will go to any length necessary to make themselves look like white nationalist Trump supporters.
But this WaPo headline is very misleading. Being on a watchlist doesn't mean your under any type of surveillance or are prevented from going anywhere. I don't think that this gathering would set off alarms unless there was some critical mass of them getting speeding tickets or something. It's not the same as the no-fly list and there are like 1.8 million names in the database. We can't exactly keep tabs on all these guys.