Not that I am against (peaceful) protests in principal, but on an informed topic where the leaders and followers are aware of all the facts, anything else is borderline incitement, especially if some of the protestors then go on to turn things sour/unlawful as often happens in poorly planned/uninformed protest.
I sincerely hope it goes well. The best thing we can do right now is protest austerity as much as possible. As many people know austerity isn't necessary as the Tories are making out it is simply there choice to impose it on us. Be careful though, passions will be running high and things could easily get out of control.
You are probably the best advert for continued austerity there is: