Instead of importing them each year, why not enter them in manually and set the correct recurrences. Then you do not have to worry about them in the future.
I had used something online that updated Outlook with the holidays and was going to sync that with the BB.
CAUTION: it added every obscure holiday, event and what-have-you. I believe I wound up with dozens of unless items in my Outlook so I erased everything from Outlook and re-synced with my BB.
