I like to go to some festivals each year, to find and see which artists are attending I often use PartyFlock which has a lot of community driven information on it. The problem is that their site is not that mobile friendly and the UI could use a touch-up. That is why I wanted to create an app to let me see that info on my phone, so I started working on a Xamarin iOS app, named eventally. Sadly PartyFlock does not have an API, so the app crawls the website and parses the HTML.
It is currently a work in progress.