No pack required - a yearly automation does the job
We have three types of holidays:
Fixed dates like New Year’s Day Variable dates like Labor Day An automation runs once a year (or more if you want) to update the dates.
You can use as a sync page or in a cross doc to fuel other documents. via a sync page you cannot access the values living in the table via a CD you can use the values in your table in the target doc, no need for two way sync.