A sharp-eyed museum docent once noticed that a painting had been mis-dated, realizing that the figures in the work were actually attending a costume ball dressed in the fashions of the previous century. Based on this clothing, the work itself had been attributed to the earlier era. Once the docent pointed out a few anachronisms, the error was fixed.
From costume balls to high-tech parties, events that feature a specific theme have been popular throughout history. Mardi Gras and Hallow