A one week draw has happened in the past (at least in 2019) only when there has been a reason to do so - anticipating the Christmas break or to make up for a skipped draw.
This year, IRCC has been remarkably consistent with draw schedule and draw size. 3,900 every two weeks has been the norm since targets were declared and it seems exactly designed to enable them to invite just over 90,000 by mid December. 91,800 was the mid-target declared for the year for express entry (low was some 88,500 and high was 100,000). Even during covid lockdown, they managed to keep this rate consistent even though they skipped a few days when the crisis first started and then brought it back on track by doing a slightly early draw.
So I don’t think there will be a draw on the 15th. But there should be a draw on the 22nd.