October 18th is National Sunday School Teacher Appreciation Day

"Sunday school" is the generic name for many different types of religious education pursued on Sundays by various denominations. 

Sunday school often takes the form of a one hour or longer Bible study which can occur before, during, or after a church service. While many Sunday schools are focused on providing instruction for children (especially those occurring during service times), adult Sunday school classes are also popular and widespread. 

Sunday school teachers are usually lay people who are selected for their job by a church board or committee, normally because of their advanced experience with the Bible few teachers receive any formal training in education, though many Sunday school teachers have a background in education as a result of their occupations.