(emphasis added)We had dress rehearsals for choir and orchestra, too. It meant going through the concert as though it were the real thing, with lights and sound and no interruptions.
I might use: a final dress rehearsal, since you stated it was the last one before the actual performance. That's not absolutely necessary, but there can be more than one dress rehearsal.
A more casual term: a final run-through
Thanks Nunty.In that context, I would definitely use "dress rehearsal". Dress rehearsals are often open to limited audiences.