I cruised on Century B2B2B Jan 18, 22 27 th and I'm going back Feb. 19th for another 5 day cruise.
You can bring your alcohol in a carry on because it is not Celebrity doing the scanning. Be discrete however. We have never had our favorite beverage confiscated when boarding.
There is only one informal despite what the booklet says. The semi-dress up is for the Captain's club party and free cocktail on day four.
Each short trip has a character of its own. Many companies book large groups for their employee get together on board.