I cannot emphasize enough that right now the US Government WANTS race riots in cities across America, to distract from IRS-gate, to distract from DOJ-gate, to distract from NSA-gate, to distract from PRISM-gate, to distract from Benghazi-gate, to distract from EA-gate, to justify declaration of a National Emergency, to justify suspension of the Constitution, to justify a gun-grab, to have a small civil unrest to brutally put down to discourage a much lager uprising of the entire population the government could not hope to deal with. Too much corporate media focus has been put on this one case, with far to much emphasis on the racial overtones. Too many suspicious Facebook posts and tweets keep selling the idea that a Zimmerman acquittal will or should trigger mass riots.
Don't fall for it.
Don't be as stupid as the US Government hopes you are.
Anyone in your group calling for a violent demonstration, anyone pouring gasoline into bottles to hand to YOU is most likely an undercover government informant trying to stir up trouble the government needs to save itself from the flood of scandals and collapsing economy.
Ignore them.
Stay calm.
Don't fight the fight the government is already prepared to win.