It’s called a general strike.
If everybody does participate, then it amounts to burning down the whole city.
It's such a dumb idea that it's almost indistinguishable from an attempt at subversion by the actual parties/powers being protested. Announcing such an effort 3 days ahead of time while making no specific demands is just icing on the proverbial cake.
Put another way: should television and newspaper reporters not work, and avoid covering any of the protests?