Just tell the bartender you have the NA drink package.
And since you mentioned you're in a suite, you don't use your vouchers during the suite happy hour anyway.
As it's forecast now, I wouldn't think any stops to Bermuda scheduled for this weekend would happen with Idalia modeled to hang around the area for a few days. Of course, plenty of time for that to change.
That's displacement tonnage. Why they picked a unit of "tonnage" to measure volume is beyond me.
But that's why Icon class, while being 25k gross tons bigger than Oasis has largely the same dimensions of Oasis (360m x 47m compared to 365m x 48m)
I would imagine RC has agreements with some ports that they pay the port fees no matter what. Maybe Carnival just takes that on the chin and refunds it anyway, even though they still owe the port.