If you’re like most people, you probably have a calendar filled with all of your favorite US holidays. But if you want to add US Holidays to your iPhone calendar, there are a few things you need to do. First, open the Calendar app and click on the three lines in the top left corner of the screen. This will show you a list of all of your calendars’ events. On the right side of this list, you’ll see a list of US Holidays. To add US Holidays to your calendar, just click on one of these dates and it will take you to a page where you can enter all of the information about that holiday. Here’s an example: on December 15th, 2017, Apple will be celebrating Christmas! To add this holiday to your calendar, just click on that date and it will take you to a page where you can enter all of the information about that holiday.