I've seen a tweet from the National Organization of Social Security Claimants Representatives (NOSSCR) saying that any hearings scheduled for the Friday after Thanksgiving will go forward despite the announcement that Social Security offices will be closed to the public that day.
I've been practicing Social Security law for 40 years and I don't think I've ever had a hearing scheduled for the day after Thanksgiving. (I did have one scheduled for 8:30 a.m. an December 26, however, many years ago.)