OK, there are still spaces for the midnight cruise available, so book it if you can;
Here is the brochure for the midnight cruise; http://www.harborcruises.com/pdf/moonlight.pdf
call 410-347-5555 for reservations. Sometimes they answer direct and sometimes you have to press "O" to get someone.
Ask to be seated with Jack Spotts party.
I have just booked reservations for refrtech and his "friend" since refrtech is still on vacation with his family.