FARGO, N.D. - The Dixie Chicks have canceled their Aug. 26 Fargodome concert, a move their promoter attributed to the need to promote a fall documentary. A statement Friday said the Fargo show and other concerts in August and September were canceled so the band could promote the documentary "Dixie Chicks: Shut up and Sing," for the Toronto International Film Festival in September. Most of the canceled shows were rescheduled for later in the year. The Fargo concert, however along with appearances in Des Moines, Glendale, Ariz., Knoxville, Tenn., Greensboro, N.C. and Houston disappeared from the updated schedule altogether. Instead,...