I hope not. A dull, uneventful demonstration is worse than no protest at all.
The time to mount this one is around 3:30 PM and make it loud and angry when the Exchange shuts down. The disadvantage there is the third shift of cops will be coming on and there will be plenty of them. But if the mob is dense enough that only the fringe can be moved a few at a time, Wall Street is very narrow and it could take many hours to clear it.
The more the merrier. Hopefully one of these days the numbers will be sufficient and their behavior, law/permit violations, or whatever will require NY's finest to move their asses out of there. Let the games begin!