A notice of a meeting of the Friends of Bill W. on your cruise ship daily schedule indicates an Alcoholics Anonymous meeting. William Wilson founded AA as a society of members dedicated to helping each other achieve and maintain sobriety. Members use the euphemism "Friend of Bill" or "Friend of Bill W." to show their membership to one another while maintaining anonymity, since many non-members would not know the meaning of the phrase. You might occasionally see the term shortened to "FOB."