It would have to be a discount for me to go due to potential issues.
Might want to check out why they are going to dry dock. Sometimes it's for engine refits and such and not new areas so there might be less chance of disruption. I've heard people going and say it was awful and also some who said they saw nothing going on.
It's kind of the same issue with going the first sailing after dry dock or a new ship. They are still working out the kinks, testing new parts, the crew isn't familiar with all the new policies and systems. It's a gamble.