The Waterstones branch Piccadilly, London, is planning to hold the high-security signing on Wednesday September 8. The protest begins outside that store at 12.30pm on the same day.
There will also be protests across Britain, so if you don't hear about one at your local Waterstones bookshop organise your own and turn up anyway.
In Boston, Lincolnshire, we are organising a protest outside the local Waterstones shop on Saturday September 4 from 11am to 2pm.
If the book signing is not called off by Waterstones there will also be a vigil on Wednesday September 8 from 12pm to 2pm when we shall be calling for a boycott of Waterstones.
We invite all local comrades within range to join us in Boston.
Peter Brown Boston