SpiffCalendar is a Javascript library implementing a calendar that is roughly similar to Google Calendar.
SpiffCalendar features a clean API and a clean place where there could be docs (but aren't) - so you get to dive right into the code!
Please use the Github issues:
https://github.com/knipknap/SpiffCalendar/issues
A simple example is here:
https://github.com/knipknap/SpiffCalendar/blob/master/demo/demo.html