"Brooklyn Sanitary Fair, 1864."
"Sanitary Fairs" were elaborate fundraisers for Union forces organized by the USSC.
The lithograph shows a large, elaborately decorated room filled with dining tables, well-dressed men and women, American flags, and green boughs.
Source
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"Brooklyn Museum - Brooklyn Sanitary Fair - overall."
http://en.wikipedia.org/wiki/File:Brooklyn_Museum_-_Brooklyn_Sanitary_Fair_-_overall.jpg
Wikipedia
Public domain.
