Shared calendars are also displayed by CalenGoo:

Using shared calendars to add holidays to your calendar

Adding holidays to your calendar is easy:

Either add them directly in Google Calendar by clicking “Add” under “Other calendars” on the left and then “Browse Interesting Calendars”:
Or you can search for a holiday or sports calendar e.g on http://icalshare.com/ or http://www.markthisdate.com and add it to your calendar:

Afterward you have to sync CalenGoo. Just tap “Start Sync” in the upper left corner of CalenGoo’s day view.

Google Sports Calendars

Google Sports calendars can also be displayed by CalenGoo. And you can use Yahoo Sports calendars in your Google Calendar: Go to http://sports.yahoo.com, search for your favorite team, click "Scores & Schedule", then "Add to Calendar" and choose "Google Calendar". When you add such a Yahoo Sports calendar, it will also be synced with CalenGoo.

There are also other event sharing sites where you can download/get sports calendars like e.g. http://www.markthisdate.com that will work with CalenGoo, too.

CalenGoo

Documentation

Using shared calendars to add holidays to your calendar

Google Sports Calendars