[MLnick]

This is very similar to an idea I have had in my head for a while now (I put it up on the recent startup ideas Google spreadsheet). The main angle that I thought would be to have it built around a recommendation engine that tries to actively show you things you may like to do with friends, family, etc. The main key innovation I had in mind was trying to use images to come up with recommendations, ie if you post pics of mountain biking it looks for upcoming races etc. If you like the suggestion you can share it with your friends and create an event for a group.

I reckon if done in the right way (ie good privacy approach and user control over it), you should be able to make money through links to the events (although I think the revene model would need to have the right incentives ie aligned to suggesting the best stuff).

And the image stuff is hard - but would be pretty great if done right!