Ask HN: Why is local event search so bad?

Trying to find events (block parties, concerts, carnivals, festivals, etc) always seems horrible online. Google and Facebook both have very limited options, and the quality of the data seems horrible. Has anyone worked on this problem and know why it's relatively unsolved? My best guess is that the limited time of the events makes it so that the amount of revenue possible per event sourced is low. Still, it seems like a reasonable revenue stream for one of the big tech companies and I'm curious why it seems underinvested in.