Sorry, I couldn't find pricing data for that day. The closing price for the Dow Jones Industrial Average (DJI) on September 11, 2020 was $27,665.64. It was up 0.2% for the day.
DATE
OPEN
HIGH
LOW
CLOSE
VOLUME
September 11 2020
$27,613.86
$27,828.82
$27,448.15
$27,665.64
437,527,086
Daily pricing data for the Dow Jones Industrial Average dates back to 1/2/1950, and may be incomplete.