I came across https://tockify.com, it seems to be a calendar implemented as Software-as-service and access via http. It could be useful for wordpress (or other CMS) sites where plugins are unavailable but html is.
I have just installed the time.ly All-in-One Event Calendar, a wordpress plugin on this wiki/blog. It’s rather cool, you can view the one event, a test on this wiki via the calendar page and here. The event has an “add to calendar” widget, which I have been playing with on other blogs. It displays a map if you want. It’s much faster than Nationbuilder. Read More