Transport for London is attempting to stage the largest ever communal jumping high five - to mark National Women in Engineering Day.
From 8.15am on 23 June, the body will try to break the world record for the number of people jumping and slapping palms.
London transport commissioner Sir Peter Hendy will speak at the event, and a film will be made to engage school pupils in engineering.
TfL said on a web page dedicated to the event: “Ultimately this is about raising the profile of engineering and technology careers for women on as large a scale as possible, by showcasing the vast array of roles that a career in engineering and technology has to offer. As such we are looking for all those working in engineering and technology fields to attend, not just engineers.
“The success of this event relies on gathering as many people as possible, so please do everything you can to help to spread the word!”
The event is targeted at women in engineering and technology. You can register to attend here.