I remember carrying a large (30+) group of deaf passengers on a 737-200 many years ago. They were all seated together at the back of the aircraft and safety briefed in groups of 10 using the group leader who translated into signing for us. The group was seated together so as not to obstruct other pax in an evac (so the thinking went). It was probably just as well that the back was used, since the L3 door had a faulty seal and howled like a banshee during climb and descent - On this sector, for once, no complaints.
How large was the group on the EZ flight?