[Amake]

Harvest feasts are typically at the end of the harvest season, August, September or in some regions maybe as late as October, while midwinter feasts tend to have more magically significant reasons behind them. It would make sense for a pragmatic "woo we're not dead yet" feast to take place around February, when the winter gets tedious, fresh foods are rare and cabin fever sets in is what I'm saying. Wait until you're reasonably sure everyone's going to survive the winter to celebrate them not dying.