Florence Duomo Cathedral Closed 4/28?

[Beyoutiful]

I'm visiting Florence via Livorno/NCL Epic on April 28. In visiting the Duomo website I see that the cathedral is closed that day. This is my first visit to Italy - can someone clarify what I'll miss seeing? The Dome, Museum, Baptistry & Crypt are all open. I'm trying to plan our trip to Florence without a tour so any insight is helpful, thank you in advance!

[anthonyy7]

The official site says the cathedral is closed but everything else is open including the dome on April 28. I'm not sure why it's closed?! We climbed the dome which I highly recommend. You'll be able to see down inside as you circle around going up the side of the dome inside. It's possible it will be open that day.