The London Improvathon 2013

Now in its sixth year, the annual Improvathon features 50 hours of continuous impro, music and performance from 25 actors and 30 guest artists. This year, each 100-minute long 'episode' will be set in Cairo in 1926, giving each troupe a tight theme in which to showcase their impro skills. For those prepared to endure the whole hog, a 50-hour pass is on sale. Or if you'd prefer to pop along for an hour or two, tickets are available for each episode.