My guess is still, as it was a month or so ago, in Feb when Flames host the Isles.
Reason being, the retro jersey schedule has all Original 6 teams on it, plus all division rivals.
https://www.nhl.com/flames/news/flam...ey/c-300298876
Only teams that don’t fall into that are St L, in last home before Christmas (hoping to get some last minute Christmas shopppers to buy one) and Isles game. No other significance of the date or because of the Isles, so may well be the date.