I finally discovered gCal Public Calenders!

Fun! I just discovered the events that you can add to your calendar. I don't know how to link to the section, but if you type in "Holidays" in the search on Gcal you end up on a page that also displays a list of things that you can add to your calender, including TVshows, Events and more. If anyone knows how to link to that section by all means share!