They use a screen now? I have not been to one in years, and of course, the sexes were separated, but not by physical barriers.
I was thinking of "Fiddler on the Roof", which I saw close to 40 years ago...(ouch).
The key word is ultra Orthodox, usually this indicates one of the Hasidic sects. Modern Orthodox Jewish weddings might have the sexes segregated at the ceremony, but wouldn't at the reception.