The protest is in response to part of a display on evolution being censored following a complaint to Abington Park Museum.
A passage in a display on Charles Darwin at the Northampton Borough Council-run museum was covered up after a complaint from
a Christian. The move has now sparked the Northampton Socialist Forum to decide to hold the protest tomorrow.
As reported in the Chronicle & Echo on Thursday, four lines of text were obscured.
The information in the display explained how Charles Darwin used fossils to formulate his theory of evolution, which the forum said was "established scientific fact".
Patrick Markey, of the forum, said: "People are entitled to have all sorts of ideas, but no right to impose them on others.
"This is a public museum and should respect rational scientific thought, not the ideas of some religious fundamentalists."
But Lewis Houston, who raised the issue some years ago with the museum, told the Chronicle & Echo that the issue of creationism versus evolution was not the basis of his query. Rather, he said, it was the accuracy of the text.
The National Secular Society has written to the borough council.
Society president Terry Sanderson said: "There is a global push by the so-called 'creationist movement' to undermine the theory of evolution. It is incumbent on all educators to resist this attempt to deny evidence and, in the process, retard science and progress.
"Visitors to the museum are entitled to a better explanation of Darwin's world-shaping idea than the bowdlerised version you have on display at present."
Councillor Brendan Glynane, the cabinet member for museums said: "There was absolutely no attempt at censorship. The text contains a factual error which could cause confusion.
"It is disappointing to see that some groups have tried to use this error to further their own agenda and make proverbial mountains out of molehills.
"We have now uncovered the display board and are in the process of getting a new board produced."
The text has been uncovered and a new board is being made.
The council says the revised wording will read: "He used the same layers of fossils to show the slow changes that are taking place over the millennia of earth history, each small change enabling a species to adapt to the rigours of its environment – the struggle for survival, through the natural selection, leading to the survival of the fittest."
The council says it will not take up the National Secular Society's offer to pay for the replacement.
n Lewis Houston's letter, page 10.
