Just a simple march will not work. We have to go farther than that: http://pushbackuntil.com. Or we do the march and the traffic slowdown. If we do not do the traffic slowdown, anything else will be meaningless. I suggest we do both.
I went to the Promise Keepers event in DC in the mid-90s. There were so many people there that the city had no choice- we shut that place down. The traffic disruption was just a by-product of massive numbers.
We can do it again! July 4 this time!