I did a funny thing in the late 00s, which taught me a lot about how a solution can be unfit for the problem at hand.
Partly inspired by my friend @evan, founder of Wikitravel among other things I tried to use Wikimedia to build an world-wide events site.
It got some amount of uptake and carried on for a year or so, but finally it turns out that the volume and volatility of event data do not lend itself to this kind of effort, and so I started writing scrapers.