The March for Free Expression has just posted a statement of principle on its website. It reads:
The strength and survival of free society and the advance of human knowledge depend on the free exchange of ideas. All ideas are capable of giving offense, and some of the most powerful ideas in human history, such as those of Galileo and Darwin, have given profound religious offense in their time.
The free exchange of ideas depends on freedom of expression and this includes the right to criticize and mock.
We assert and uphold the right of freedom of expression and call on our elected representatives to do the same.
We abhor the fact that people throughout the world live under mortal threat simply for expressing ideas and we call on our elected representatives to protect them from attack and not to give comfort to the forces of intolerance that besiege them.
Anyone willing to support this can check the website regularly, as linked to above, or email the campaign at firstname.lastname@example.org