By Ashlyn Little After 25 years of entertaining Southwest Louisiana, the swing band Beauregard’s Courtesy will give its final performance at 7 p.m. Friday, Aug. 15, in the Wooten Theatre in DeRidder. Admission is free. Four guest vocalists will be making their return to the band for the final performance — Missy Dear, Leah Thompson, Tonia Cooley and Ericka Anderson. “It has been a pleasure and a privilege to play with the members of Beauregard’s…