London History Day
Time Out says
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London History Day is back for its third year, even if the date itself celebrates over 150 years of Big Ben keeping time in the city. On the day, loads of London’s museums, galleries and cultural spaces will open their doors for behind-the-scenes tours, rarely-seen exhibits and one-off events. There'll also be plenty of historic walking tours to take part in, so you can learn about the capital like never before.
It's a massive, cross-capital operation, so head to the website for the full programme of events.