here is some food for thought. I live in New York City, obviously Brooklyn to be specific. I'm the guy who started "Sell the Knicks" in 2006 when Isiah Thomas was going apeshit and they fired Larry Brown. Before the advent of Twitter, and facebook I did what I could to get the word around about the movement. We definitely had a lot of followers and press. I had articles in the NY Daily News, NY Post, Newsday, and actually even the NY Times. Sell the Knicks was featured on SportsCenter as well as an episode of PTI with Wilbon and Kornheiser.
The height of the movement came when the Knicks' owner, James Dolan, shut down our t-shirt manufacturing citing intellectual property and threatened to sue. This is where a lot of the major media jumped all over him and got us a lot of publicity. Now remember, this is in NYC and pretty much every single Knicks fan was against Dolan/Isiah at the time. There was no divide, save for the people who thought it was pointless or a mechanism to sell t-shirts. Opinion-wise, everyone was pretty much on board with ousting those two clowns, even if they hated Larry Brown at the time. This is a big population.
The big event was supposed to be the NBA Draft. I organized a pre-game party at a local bar where there were drink specials and tons of free food. TV networks, reporters, and all that crap showed up, similar to the experience SoC has had to date. The plan was we would march from the bar about 10-15 blocks to MSG where the draft was being held. Despite us having followers in the high hundreds supposedly attending, maybe 25 people showed up. By the time we got to MSG we had collected another 20 or so in the rally. Granted, this all happened on a weeknight and started at like 4PM, but the turnout was poor compared to our expectations based on online comments.
I still feel like we made a decent attempt to get our voices heard, and I believe they took notice since they sent a cease and disist. It probably came standard from the legal department though, and didn't make a dent. The air definitely came out of the balloon and things sort of went away shortly after. Dolan was/is still terrorizing the Knicks until he finally hired Donnie Walsh in 2008.
I have no clue if you guys will have better luck given that its a weekend, people were already planning to go to the game, there are better means to get the word out, etc. I hope it goes well and I can see all black on TV when I watch. I will say though that its been my experience that people talk a good game on the Internet but are generally afraid to show up in person.