The fact that anyone would register is the scary part.
I would register ... using the same approach I employ whenever I get a call from one of those Social Security or Microsoft Windows scam operations in India: I give them the name, phone number, address and date of birth of my Democrat congressman. :-P
If you’re a member of a church, they have a registry. Whether they give it to the govt is another thing. The Commie mayor is wanting you to sign in as you enter. It’s blatantly unconstitutional without a doubt, citizens are supposed to be free to move about, assemble, and even protest the communists.
Don’t forget the American Nazi was an actual group right before WWII. Communists/Socialists have been infiltrating/ “organizing” in the USA since 1917(maybe before that).