Well, this could go either really well or very badly, as I don't think anything like this has happened before. Either gamers will come together and make a stand and get their point across, or either they'll come together, innocently dress as someone like Master Chief, and be reported in the media as a bunch of whackos. Hey, more power to you if you succeed at the first one.

From the article:

Empire Arcadia - frankly, GP is not familiar with the site - says:

We will protest, mourn and show how real gamers play videogames peacefully and responsibly.

This demonstration is to show that gamers will not take the blame (for) this tragic (VA Tech) matter but we will do what we can to help put an end to terrible events like this.

We… urge that all leaders of gaming communities, organizations down to the last gamer to set aside 10 hours of this day to pay respect and come together not just as gamers but as HUMAN BEINGS for peace. Bring your Game Boy Advance, Nintendo DS and Playstation Portables. Bring your favorite games to link up and play with your friends. Tetris, Tekken DR, Mario Kart and more.

Read the full article over at gamepolitics.com