Interesting and unusual things to do for a fiver or less this week.
Monday 15 April
#SMILEON: If you spot a bright yellow post card on your tube seat this week, please disregard your instincts to sweep it to the floor in total disregard. Instead, take a look at what's on it, as #SmileOn is a campaign designed to bring smiles to the surliest of customers: Londoners.
FASHION PHOTOGRAPHY: Photographer and filmmaker Denis Peal presents images from his commercial work, as well as personal projects, with a focus on deconstructing the traditional fashion image. Free, just turn up, until 9 May
Tuesday 16 April
COMEDY: Ellie Taylor, Funmbi Omotayo, Ivo Graham, The Intimate Strangers, Hill and Weedon and Same Golin make the line-up of The Secret Variety Club, a bargain comedy night. £3, just turn up, 8.30pm
Wednesday 17 April
THATCHERISTIC: To coincide with Margaret Thatcher's funeral, ArtBelow open Thatcheristic today at Gallery Different, with 10 UK artists revealing their different depictions in portrait form. Free, just turn up, until 26 April
Thursday 18 April
HUMAN RIGHTS: Peter Tatchell, renowned human rights campaigner for equal rights, democracy and global justice, will be talking as part of Campfire at ditto TV studios tonight. Free, RSVP online, 7pm
FASHION: Vintage Rocks! is a night of fashion and music, where London boutiques showcase their collections then set up shop so you can browse what you have just watched. £3, turn up or email to guarantee entry, 7pm
Friday 19 April
AART: Ffound is a new exhibition at the Woolff Gallery, which features work by 10 artists, all of whom are working in found and recycled materials. Free, just turn up, until 25 May
Saturday 20 April
FOOD FESTIVAL: The Camberwell Food and Drink Festival starts this week. As well as food there will be free cooking demonstrations by local chefs, music, quizzes and face painting. Free, just turn up, until 27 April
GREENPEACE: To mark a global day of action for We Love the Arctic, Greenpeace a putting on a visual display capturing the beauty of the frozen landscape, in the gardens next to Friends House on Euston Road. Free, register interest online, 8.30pm
Sunday 21 April
WINDOW EXHIBIT: Fashion is linked with architecture at the Regent Street Windows Project, where architects work with flagship brands to set up innovative window displays. Today there is a guided tour of the installations. Free, prebook, 12pm
FILM: London Independent Film Festival concludes today and short, documentary and comedy films are taking place. £2 (booking fee), prebook, from 1.30pm
Check out our map of free things to do in London for more frugal fun.