Although this is specifically for wheelchair access, I found this in an online
DCL information guide to the Dream for guests with disabilities:
QUOTE
THEATRES
At the Walt Disney Theatre, Crew Members will be available at the Deck 3 entrance beginning 30 minutes prior to show times to assist Guests with seating. Wheelchair seating is available in the various areas of the main seating and balcony sections. For access to seating in the center or front sections of the theater, please contact a Crew Member outside the entrance for assistance at least 10 minutes prior to the show time.
At the Buena Vista Theatre, wheelchair seating is available in the rear of the theater via the deck 5 entrance, or the center of the theater via the deck 4 entrance.
END QUOTE
And from this guidebook from Disney:
https://wdpromedia.disney.go.com/media/wdpro-assets/dcl/finder/guest-services/guests-with-disabilities/DCL_Guidebook Rev. 20 Feb. 2018 version.compressed.pdf
QUOTE
THEATRES AND RESTAURANTS
Some restaurants and theatres feature audio/visual experiences that may be unexpected. If a Guest
has specific questions or concerns, contact Special Services at least 60 days in advance of sailing
to discuss additional options. Once on board, Guests may contact the restaurant or theatre Crew
Members for additional information or to discuss seating options.
Crew Members will be available at the entrance to the Walt Disney Theatre beginning 30 minutes
prior to show times to assist Guests. Some of the shows feature audio/visual experiences which may
be unexpected and include strobe lights and the use of fog. Guests may request to hold an adequate
number of seats in the theatre if a member of their party has a disability that impacts their early show
arrival. However, these seats must be released at show time if there is a demand for seating.
To minimize the disruption to the performers and other Guests, seats located in the back of the
theatre are recommended for those Guests who may need to come and go during the performance.
Family Movie Fun Time, in the Buena Vista Theatre, is an opportunity to enjoy a family feature film
in a relaxed environment. The ship will leave some lights on and turn the volume down as audience
members are welcome to talk, leave their seats, move about, and (most importantly) have fun!
END QUOTE
and from the same document, specific to the Dream and Fantasy:
QUOTE
THEATRES
At the Walt Disney Theatre, Crew Members will be available at the Deck 3 entrance beginning
30 minutes prior to show times to assist Guests with seating. Wheelchair seating is available in the
various areas of the main seating and balcony sections. For access to seating in the center or front
sections of the theatre, please contact a Crew Member outside the entrance for assistance at least
10 minutes prior to the show time.
At the Buena Vista Theatre, wheelchair seating is available in the rear of the theatre via the Deck 5
entrance, or the center of the theatre via the Deck 4 entrance.
END QUOTE