Nope, but if there is an answer, it may look like the difference between expertsexchange and stackoverflow (the later is a good example of building for the user

Nope, but if there is an answer, it may look like the difference between expertsexchange and stackoverflow (the later is a good example of building for the users). Other commenters raise interesting points as to why this problem is harder than others - events have so many niches, there's a new set of them for each new set of users. And unlike on stackoverflow, in a month all of that data has lost almost all of its value and you need new data.