Each of HAL's Ship Dedications/Namings take on a different highlight or two. This is the first time they brought Captains from the whole fleet to the new ship.
I believe it was Oosterdam that was Dedicated in Rotterdam and another of HAL's ships was docked bow to bow with her. They had a cable from one ship to the other on which they 'launched' the champagne bottle to strike Oosterdam's hull.
Eurodam's Dedication about 2 years ago was held in Rotterdam, as well, and was outside on the dock rather than in the show lounge as was done for Nieuw Amsterdam.