I have seen ads in Craiglist where people are looking for musicians for cruise ships.
I was a stage manager and if you are a drummer who can read music you have a leg up for sure. All you need to know are the styles and how to read a chart to count of the number of bars, etc. Very unlikely you will have to sight read notes or drum fills.
Just be able to follow the verses, chorus, repeats, codas, etc.