I've deployed a test app for downloading NASA's Spot The Station sightings as an ICS calendar.

There's no fancy front end yet, just a URL Scheme that follows:

/place/Country/Region/City or /place/Country/City

e.g.

Sometimes a region is needed, other times not. For now, just use the NASA App to find the correct name hierarchy for your city.

Note: I threw this together quickly. It works, and well enough to share, but it's still at a very early stage.