NBC, 8 p.m.

In “Winterfest,” Gallo (Alberto Rosende), Violet (Hanako Greensmith) and Ritter (Daniel Kyri) debut their microbrewery business at Winterfest. Meanwhile, Brett (Kara Killmer) prepares to present her paramedicine program to an oversight panel, and Firehouse 51 gets in the holiday spirit. After tonight’s midseason finale episode, Chicago Fire will be on break until Jan. 5, when Season 10 picks up with new episodes.