Ad For River--Huron River Day Chairwoman Shirley Axon speaks of the annual river celebration, to be held Sunday, July 10, at Gallup Park, while Canoesport owner Ned Sharples, who arranges the day's exhibition of wood and canvas canoes, waits his turn. Cameraman/director Andy Watts tapes the five-minute program, which will be televised next week on Community Access Television. Among new events this year are flycasting, demonstrations, aquarium displays of Huron River fish, a performance by the Ann Arbor Civic Band and several new slide programs.