Really? 'Cause my Google Calendar didn't have the holidays on it.
On the plus side, I have now learned how to get my Google Calendar to have all the holidays on it.
Go to your Google Calendar online (i.e., log in with gmail).
On the left, you'll see Other Calendars.
Click on the down arrow and hit Browse Interesting Calendars
From there, you can see a list of Holidays (by country or religion) and various other calendars you may wish to add. Subscribe to the calendars you want.
Now, go back to your Maxx. Open your calendar. Hit Settings, and select the calendar with your email addy. The new calendars you've added will be there, and you have to check the little boxes so that they'll sync with your phone.
Result: Holidays now on your Maxx calendar. (Victory!)