The Museum of London is collecting placards and flags used by protesters at a recent demonstration in the city against public spending cuts.
University students have already gathered hundreds of items from the event.
Now protesters are being asked to bring more memorabilia to the museum.
Organiser Guy Atkins said the idea was to give them the chance to influence how history remembers them.
The BBC reports the main demonstration on 26 March was peaceful, but a small group attacked banks and shops, leading to 214 arrests. Sixteen people were injured, including 13 police.
Historian June Purvis, who wrote a biography about suffragette Emmeline Pankhurst, said the event would be remembered as a significant moment in history.
The museum said there would eventually be an exhibition showcasing the collection.