Yes, slippers are provided in Concierge. Also, robes are provided and the robes are NOT petit sizes. Fit us just fine. I am 5 feet 10 inches and weight 190 and it fit nicely.
Restaurants opened at 5:30 pm on our Beyond Cruise. Shows were at 7:30 and 9:30 pm.
There are themed dinners up in the OceanView. Mexican night, Great Britain night, Italian night, etc.
You may get some noise from the buffet above you.
On the first day when you board, they were offering guided tours of the facilities of the spa. The sequence of using the rooms of the Thermal Suite was explained. It was well worth the time to gain a better understanding of all of the rooms.
Are you referring to Specialty Restaurants? Then the answer is 'YES' if you are using Celebrity OBC or if you are paying by credit card. As for the MDRs, it is Anytime Dining. Just show up to whatever dining room when you want to.
When we sailed in Alaska, there was a posted dress code in the daily. It said. 'Long sleeved dress shirts'. I only brought one long sleeved shirt. I was worried when I wore a short sleeved shirt- but not a problem. I felt relieved when upon entering the dining room, it looked like a lumberjack convention going on. No utility belts though. No offense intended to all you lumberjacks or those aspiring to be lumberjacks.......
Be advised that there are NO Specialty Dining benefits for Elites. However, there is 15% discount for Elite PLUS members. That is a different tier. You may have been given some incorrect info.
Also, many zeniths are hooked on Celebrity and no need to get feedback from them. Many are guaranteed bookings. But I think it is more related to numbers.
You just show up at the dining room of your choice when you want to eat. If you find a particular server you really like, you can ask to be seated in that area on other evenings. No need for reservations.
The last departure for the bus was at 8:30 am. However, we had to wait nearly an hour for a bus to return to pick us up. Mess. I suggest using Luggage Valet and taking a taxi or Uber over to the airport when they throw you off the ship. Then you will be able to go through airport security as you will not have any luggage to check. A couple of weeks ago, you could not check in with luggage until 4 hours before your flight.