The population of the tiny DeSoto Parish town of  Keatchie will increase exponentially this week as the cast, crew and hundreds of extras descend on Circle T Ranch for the final week of shooting of the independent, family film “Dakota’s Summer.” The coming-of-age drama is a companion film to “Cowgirls ‘n Angels” released last year. It’s a glimpse into the world of the competitive cowgirl rodeo circuit.