All the US holidays follow simple rules. Thanksgiving is the 4th Thursday in November, for example. If you create them in the calendar and make them recurring events, they'll always be correct. You only have to do it once.
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Also, if you have google then you van sync a holiday calendar.
I'm using my phone so I can't google it for you amd post it, but google will tell you how to add a holiday amd then the forums here will help you with the rest.
I hope this was helpful (moderator)
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