6 Day Cruise on Regal, which nights are formal night?

[bbunch04]

Leaving in Dec. for a 6 night cruise on the Regal.  We are wanting to schedule dinner in the Crown Grill one night but didn't want it to overlap with formal night.  Does anyone know which nights will be formal nights on a 6 day cruise?  The website states there will be 2 formal nights.  Sea Days 1 and 5?

TIA

KB

[Torfamm]

You can see which nights are scheduled as formal nights in the ship’s schedule under “Journey” in the app. Every evening will show either “casual” or “formal” portraits. You can also see when the champagne waterfall is scheduled as an indication. I’ve seen it populate as much as a couple of months before a cruise.

Formal nights are never on the first or last night and are usually, but not always, on sea days.