A member sent me this today:

In observance of the Day of Mourning for Jimmy Carter, the markets will be closed on Thursday, January 9th, 2025. Options with a January 9th, 2025 expiration will be accelerated and expire on January 8th, 2025 instead. As most banks will remain open, Thursday January 9th, 2025 will count as a settlement day for Trade and Deposit settlement purposes. Margin calls due on the 9th will receive one extra day to be met by the 10th.