It is subject to availability so can only be done on board . Suites are sailing nearly full since covid so possibly not going to be available . You can always arrange to eat with them in the MDR
We are usually Celebrity Cruisers but just booked Azura for Xmas 2023 at a bargain price including flights . We have adjusted our expectations accordingly 🙂
It doesn’t sound like a ‘package holiday’ just the cruise and flights bundled together. If you have an Easyjet reference Have you tried checking in on the easyjet website which you should be able to do 30 days before the flight