“National Back to Church Sunday began in 2009 as church attendance in America was declining, and church leaders began to look for ways to involve their congregations in reaching out and inviting friends, neighbors, and coworkers to come back to or try church for the first time. It is a day set aside for churches across America to invite their community to a Bible-based church, whether for the first time or as a returning member.” (https://www.backtochurch.com/)