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This major financial institution closed the Stock Market for the 10 long days due to the market being disasterous.
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During this span, 8 blizzards occured and affected either the opening or the closing bell of the Stock Exchange.
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As 15.3 inches of snow covered the New York streets, the Stock Exchange was forced to close for a day and a half.
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Previously planned, the Stock Exchange closed to join everyone in the celebration of the landing of Apollo II on the moon.
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After a major New York City blackout occurred, the Stock Exchange decided to close its doors.
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Due to terrorists attacks and burning down of the Twin Towers, the Stock Exchange closed for 3 days. A year after the attack, the Stock Exchange closed once again to mark the one year anniversary.
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Due to a "Flash Crash," similar to the one in 1977, caused by an automated high-frequency trading, the New York Stock Exchange once again had to close down.
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NYSE shut down due to hurricane sandy passing trough the Eastern Seaboard. First weather event to shut down the system for two days (http://www.motherjones.com/politics/2015/07/new-york-stock-exchange-shutdown-history)