17 September this year is a Saturday. Think Wall St. gives a flying bleep about these turkeys rioting on a Saturday? Board up the big plate glass windows (not too many of those on Wall St. any longer, btw) and let the Marxists riot.
Now, if Wall St. were bold, which they aren't, they might consider hiring a few folks to, shall we say, sabotage the riots in assorted ways.
It may be a Saturday, but they intend for the event to last a few weeks. I guess Saturday is just a good day to settle in with little resistance?