Advertisement You probably know that Google Calendar has tons of great features that help you manage your wild schedule. But did you know that it also offers sharable calendars? These let you import all sorts of events onto your calendar without doing any of the work of setting them up.Let’s take a look at some of the most useful public (or at least, free) calendars you can add to your Google Calendar. With them, you can keep track of nearly anything.1. HolidaysGoogle Calendar has built-in support for all sorts of holidays. To access them, click the Gear icon above your calendar and choose Settings. On the left side, expand the Add calendar section and choose Browse calendars of interest.Here you’ll see holidays broken down by religion, such as Christian Holidays and Muslim Holidays. You can also expand Regional holidays to add calendars for public holidays in a huge list of countries.Simply check the box for any holiday calendar you’d like to add, and you’ll … [Read more...] about 10 Free Calendars You Should Add to Your Google Calendar