Marvin will but he shouldn't. NO ONE can waive your contract for you.
Which is why (at the start of the trip) you give the Captain your cell phone number along with the admonition that he not waive nor volunteer you for anything without your concurrence, unless it involves the Swedish Bikini Team or some other likewise talented group of individuals.
Swedish Bikini Team - Wikipedia, the free encyclopedia
https://www.youtube.com/watch?v=-c2NEFPqTwY