Mary Lou, Not necessarily a trick. Celebrity does not as policy offer bridge tours, however, they leave it to the Master of the Ship to have some people up to the bridge at their discretion. Bridge tours are sometimes oferred for Captains Club members, again depends on ship and Captain.
I would locate the Social Hostess and ask her if the Captain will be hosting any bridge tour during the cruise and request she smuggle you and hubby onto it if at all possible. Bridge tours can be gotten sometimes, the real trick is to get an engine room tour, near impossible unless you become personal friends with the Engineering Captain or whichever rank the Officer in charge is.
They do have video played in your cabin of the bridge and galley, engineering sections and so forth.
George in NY - let us know how you make out and have a great cruise! Happy New Year