I found a some instructions to add US Holidays to my iPad Calendar. Here they are if you're interested.
1. Go to Settings>Mail, Contacts, Calendars
2. Under Accounts, tap Add Account
3. Tap Other
4. Under Calendars, tap Add Subscribed Calendar
5. In the Server box, type http://ical.mac.com/ical/US32Holidays.ics
6. Tap Next
7. Tap Save (no other entries needed)
When you go to the Calendar app, you see the holidays listed. If you decide you no longer want the holidays, you can delete the account in Settings>Mail, Contacts, Calendars.
1. Go to Settings>Mail, Contacts, Calendars
2. Under Accounts, tap Add Account
3. Tap Other
4. Under Calendars, tap Add Subscribed Calendar
5. In the Server box, type http://ical.mac.com/ical/US32Holidays.ics
6. Tap Next
7. Tap Save (no other entries needed)
When you go to the Calendar app, you see the holidays listed. If you decide you no longer want the holidays, you can delete the account in Settings>Mail, Contacts, Calendars.