The protest, which has been shared as an event on Facebook with the slogan staying alive on the M25 , is set to last from midday until 4am on February 20.
Demonstrators draped the huge placard - which was black with white writing on it - from the balcony in the central London court (pictured) before it was ripped down.
The group began a wave of demonstrations last year which included blocking the M25 and other roads in London, including around Parliament, as well as roads in Birmingham, Manchester and Dover.