From the good ole FB:
Age 74 Proposed Changes: October 24, 2017
Age 74 Final Changes: November 1, 2017
Age 73 End: Saturday November 4, 2017 @ 00:00 GMT
Age 74 Open: Saturday November 4, 2017 @ 06:00 GMT
Age 74 Start: Monday November 6, 2017 @ 18:00 GMT