Planning a Saturday night is hard work in a big city. Millions of things to do. But more often than not, when I'm visiting friends in London we spend hours browsing Time Out only to end up in the local pub because the gig we wanted to see was too far away, too expensive, on too early, not the right
kind of music, sold out, etc.
We need a what's on guide for people who are too lazy/pathetic to choose a venue on their own.
I suggest a website featuring personal user pages and location/event pages. To start off, it would only cover music, but could later be expanded to include theatre, film, museums, and so on.
Event organisers submit their listing like on any other listings website.
But now the idea is to apply the concept of matching websites such as okcupid and stumbleupon to a what's on guide.
New users simply state their favourite bands and venues. More loyal users are encouraged to keep a diary of gigs they've seen, along with reviews and recommendations. A simple statistical algorithm matches users with similar tastes on a percentage basis.
When a user logs on, the website suggests a number of events, ranked according to how well the event matches the user's taste (based on similar users' behaviour), proximity and price. S/he can also browse personal pages of users similar to them to find recommendations.