The convention is at Madison Square Garden (between 32nd and 34th); this will mostly disrupt the commuters from NJ and Long Island coming into Penn Station and those working in the Garment District. Most of the theaters are in the West 40s or 50s. That's far enough away from the action of the convention if seeing a show is important. Late August can be a good time to get tickets to the shows. Many of the Manhattanites have fled the city to get to the beaches. August can be beautiful, but it can also be sweltering.

Marc's suggestion to check with the concierge on timing makes a lot of sense. Walking is also the best way to get to and from the pier, but if you catch a sweltering day, it is no fun. Another option is to get tickets for half off at the TKTS booth on the day of the show. They generally have a choice of excellent shows but will have few, if any, tickets to the newest and most popular shows. It's at the north end of Times Square (47th & Broadway/7th Avenue) and opens around 10 or 10:30 am.

Enjoy your cruise! Cheers, Anne