No, The Stock Market in the United States is not open on Christmas Eve, Sunday, December 24th, 2023
Christmas Eve is on a Sunday in 2023. The stock market is always closed on Sundays. The Stock Market will not reopen until Tuesday, December 26th since the US Stock markets will be closed Christmas Day, Monday December 25th.
Source 1 - https://www.nyse.com/markets/hours-calendars