Please don't use consensus to make decisions. (In my experience it always led to chaos and manipulation. I suggest approval voting with a initial primary vote and then one runoff, and with an initial non-binding preference poll.) These groups can send representatives to larger alliances. The groups should ask town or city hall about what will happen if they are asked to leave the initial protest site by other protest groups (who may have special permits).
The 99% movement is heavily infiltrated by a very odd and manipulative operation calling itself "The General Assembly." I believe it is a foundation psy-op. Perhaps run the "World Movement for Democracy," which is a branch of the "National Endowment for Democracy (NED)", which is a "private" non-profit corporation created and funded by Congress. (They are really Federal agents, of course.) They are electing a "National General Assembly" that will issue a "Petition of Grievances." But others can have their own alliances with their own Petitions of Grievances, of course.
It won't save the world, but it might accomplish something if more people outside of this very manipulative General Assembly would get out and protest!