Seems like they would have the christening ceremony just before they let the boat slide down the rails into the water for the first time. The boat wouldn't be complete then. Later they could have a commissioning when the boat is outfittted and crewed.
Looks to be ~1.5 years between christening (naming ceremony w/ the bubbly :) / launching, and the commissioning, for these boats anyway. This was just the first time that I had noticed that the commissioning ceremony was happening so far away from the shipyard (my ignorance here).