HOROLOGY: The science museum reveals a 'time-eating clock'. The 'Midsummer Chronophage' (above) is similar to the golden timepiece on permanent display at Corpus Christi College, Cambridge, and was also designed by Dr John Taylor OBE. The clock possesses neither hands nor numbers, and has a casual attitude to precision. You'll find it on the first floor near the café until October. FREE
SCI-ART: Last month's SameAs Sci-tech meetup was full beyond capacity, as we found to our detriment. Arrive at the Driver pub (1st floor) early to guarantee entry to a selection of talks from leading names in the sci-art scene. (7pm, FREE)
BLOGGING: Editor of ConservativeHome Tim Montgommery joins Douglas Carswel MP and editor Harry Cole to debate the motion 'Blogging: Yesterday's News?'. Judging by the panel, however, the event title could do with the word 'Political' at the start. The fun takes place at the Emmanuel Centre, Marsham Street (6.30pm, FREE but prebook).
FILM: The 10th Sci-fi London festival begins at the Apollo Picadilly Circus, which hosts a panel discussion about comic John Constantine: Hellblazer followed by a screening of the movie adaptation Constantine (5pm, £8.20).
MATHS: Comedian Matt Parker and Timandra Harkness present the 'definitive comedy show about dying', looking at the mathematics of risk. You have a 0.000043% chance of meeting your end at this show. Part of the Sci-Fi London festival. Bizarrely, neither the web site nor the Facebook page give details of price, but you'll find them at the Apollo Picadilly if you want to try haggling. (8.30pm)
DR WHO: Matt Smith and Karen Gillan return to the screen in a new series of Dr Who. The London Sci-fi/Fantasy group are watching it in the Mad Hatter pub (Stanford Street), and you're welcome to materialise. (5pm, FREE)
COSPLAY: Don your jetpack, screw in your cybernetic hand and head down to the South Bank for a science fiction Easter parade. The troupe will be led by a zombie Will and Kate. All welcome. (Noon, FREE). @scifilondon
SCI-FI: Other highlights from the Sci-Fi Festival today include Fire Hazard, a real-world spy game (10am, £5); a screening of the film The Gerber Syndrome (5.30pm, £8.20); showing of post-apocalyptic movie 100 Days (8pm, £12.20); and a special festival party at Koko (8pm, £6).
What have we missed? Let us know in the comments below.