On this day we will witness the outcome of the special Council at the Royal Palace where the King will announce the name & titles of the new-born Princess.
Then there's the Te Deum at the Royal Chapel to celebrate the birth of the new Princess.
March 12 is also Crown Princess Victoria's nameday, so she & her family will be in attendance during the special ceremony at the Royal Inner Court (mid afternoon) with many enthusiasts (and the media) watching & taking pics.

But...today it is also 42 years ago that the King presented his fiancée Silvia Sommerlath to the Swedes & the media!

As I said: a lovely day for all Swedes: both the royals and all others