december, 2019 24decAll Day25Christmas Staff Holiday Event DetailsSociety and NIOSA offices will be closed for the holidays Tuesday, December 24th and Wednesday, December 25th Have a safe and happy Christmas. Event Details Society and NIOSA offices will be closed for the holidays Tuesday, December 24th and Wednesday, December 25th Have a safe and happy Christmas. more Timedecember 24 (Tuesday) - 25 (Wednesday) CST CalendarGoogleCal