On 7 February (7.30pm), we're hosting a pub-style quiz themed around subterranean London at the Bishopsgate Institute. Although it sold out within days, we've now been granted a much larger space (the Great Hall, no less), and can open up tickets to additional teams and individuals.
So, if you'd like to test your knowledge on London's buried rivers, secret Tube lines, wartime bunkers and other underground stuff, sign up here. Even if you're not too hot on subterranean trivia, it'll be a fun night, where you'll learn all kinds of odd facts about the catacombs and tunnels beneath our city. Sign up with friends or come on your own and we'll find you a team.
Entry is just £4 for over two hours of entertainment. Bargain.
While you're here, check out the Bishopsgate Institute's mouthwatering season of talks, walks and discussions about underground London.