DEL MAR (KUSI) – The San Diego Opera will resume its 2020-21 season Monday evening with a drive-in filmed encore presentation of its 2018 production of “All Is Calm: The Christmas Truce of 1914” at the Del Mar Fairgrounds. The event begins at 7 p.m. Prior to screening the film, there will be a live concert of holiday favorites starring members of the San Diego Opera Chorus, including a singalong patrons can enjoy from the comfort and safety of their cars. This family-friendly a capella opera tells the story of the Christmas truce of 1914, when soldiers from France, the United Kingdom and Germany ventured from their trenches into no-man’s land to share food and exchange gifts on or around the Christmas holiday. Most interactions ended with the singing of Christmas carols. Fighting resumed the next day.