We are on Carnival as well. My fiance and I are not giving the option of attending the wedding and not sailing to the masses. We have preselected the people( My grandmother, great aunt, his aunts, etc.) we will allow to attend our wedding but not cruise. So on our invitations we are not even adding the option. Those individuals that will be attending but not cruising already know who they are. This way we won't have 100 people trying to attend and not cruise.