National Popcorn Day is Sunday, January 19, and movie theaters like AMC, Cinemark and Regal, as well as food brands are celebrating with discounts and freebies.

19 with their own bucket (up to a 400-ounce container, the equivalent of two extra large popcorns) to score a $5 popcorn. Between Jan. 19 — 21, City Pop is offering TODAY.com readers 25% off ...