GIVE BLOOD: Three opportunities to do the right thing today. Donate at Belvedere Road (outside County Hall), at Brewers Hall near London Wall, or at the West End Donor Centre on Margaret Street. Times vary
BOOKS: Join comedian Ben Miller at the Royal Society, as he introduces the shortlisted titles for the 2012 Royal Society Winton Prize for Science Books. Free, just turn up, 6pm
RELATIONSHIPS: When gay people get married is the topic of debate at the London School of Economics public lecture. Free, just turn up, 6.30pm
LITERATURE: Pankaj Mistra and Michael Wood talk about the end of the Qing, Ottoman and Mughal Empires at the British Library. £7.50, prebook, 6.30pm
ROCK: Rob Zombie and Marilyn Manson hit town with their Twins of Evil world tour, playing The O2. Apparently you should expect "debauchery, theatrics, ghoulish imagery, and a full-on assault of all the senses". £35.50, prebook, 7pm
SPEED DATING: All the female places are booked up, but there are still spare tickets for any men wanting to attend Last Night A Speed Date Changed My Life at Shoreditch's The Book Club. £13, prebook, 7pm
PHOTOGRAPHY: Catch Dorothy Bohm discussing her life's work at the Museum of London, to coincide with the new exhibition Women in Focus. £7, prebook, 7pm
FOLK: The much-praised Great Lake Swimmers play Bush Hall in Shepherd's Bush. A few tickets remain. £11.50, prebook, 7.30pm
COMEDY: Rob Newman and Lucy Porter are inducted into the Alternative Memorial Comedy Society at Soho Theatre, alongside Adam Larter, Thom Tuck, Alexis Dubus, Steve Pretty and lots of others. £12.50, prebook, 8pm
FILM: Catch Italian for Beginners, part of the Dogme 95 season, at Brixton Ritzy. £8.10, prebook, 9pm
Random London Fact Of The Day
Ally Pally, the familiar name for Alexander Palace, was allegedly coined by Gracie Fields. The entertainer attracted an audience of over 5,000 to the venue for a charity concert in the 1920s, and occasionally performed there with husband Archie Pitt.
Il pleut des chats et des chiens, as the French no doubt say. Don't leave the house without a brolly. Unless the fire alarm sounds — in which case, just get out as fast as you can and alert the fire service.
Secret Hidden False Rumour Of The Day
Alexandra Palace was originally known as Alexander Palace, but underwent a sex change in 1961.