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Here's Todd Klein, who was a DC staffer from 1977-1987, and as he describes it, after that became a freelance letterer, most notably on Neil Gaiman's SANDMAN series, and Alan Moore's America's Best Comics line.

I met Todd Klein by purchasing some stuff from him on Ebay years ago.

On another page of his site he shows a huge photo from a 1945 National Comics (DC) company Christmas dinner, where he made a valiant effort to identify everyone in the photo.



There's even an exterior photo of the building in New York City where National Comics' (DC's) offices were at the time.

Quote
480 Lexington Avenue was the home of most of the Donenfeld businesses from the early 1930s to around 1960. It was the address for the east side of the Grand Central Palace building, shown here, that filled an entire city block. Donenfeld’s offices and companies were on the ninth floor. The lower floors held a large exhibition hall where trade shows were presented for about 40 years, and there was probably at least one restaurant or banquet hall included. That might have been where the DC holiday party was held, we don’t know. The date of Dec. 24th, 1945 is interesting in that it’s Christmas Eve Day and despite that, the room is packed with over 200 people. This shows how local the comics business was in those days. People could attend the party and still get home to their families that evening before the Christmas Day holiday.