That's because October is Polish American Heritage Month, National Cookbook Month, and Country Music Month, as well as (the more serious) Health Literacy Month. Here is a comprehensive list of the National Months in October by the original and authoratative National Day Calendar. National Smile Month 2020 May 18 - June 18; British Tomato Fortnight 2020 May 25 - June 7; National Candy Month 2020 June 1 - June 29 If you're an American of Polish ancestry, an author or seller of cookbooks, or a country music artist, then October is the month for you. Find a complete list of October holidays below, and happy celebrating! At National Today, … Updated October 23, 2019.