The Barrett Sisters co-star in the gospel music documentary, “Say Amen, Somebody,” which will be shown at the Film Festival of Joy. Think of it as the Joy of Flicks. Also of song, spirit, community, comedy and love. The ArtYard cultural center in Frenchtown is hosting a Film Festival of Joy, July 13-17, featuring a diverse selection of shorts, features, silent films, cartoons and documentaries. Filmmakers will be there to answer audience questions, and the fest wraps up with a gospel performance by the Paterson-based group Anointed Friends. It all has been organized by guest curators Dennis Do…