The last program for the season of the Rhythm on the River Arts Series in Grand Rapids will be presented on Sunday, October 4, at 4 p.m. The annual meeting of the Grand Rapids Historical Society, who sponsors the concerts, will precede the program at 3:45 p.m., and all society members are urged to attend. Immediately following that meeting, the Otsego Show Choir and the Otsego High School Band wil…