NORTH PORT – Changes in the schedule and fee structure for programs at the North Port Aquatic Center will be the subject of a special meeting of the North Port City Commission at 10 a.m. Tuesday. Tricia Wisner, assistant director of parks and recreation for the city of North Port, said the proposed changes come from both attendance trends tracked by the city and feedback from users through surveys and other comments. The surveys were conducted online and live during special events. The biggest proposed change water park users would notice involves a proposal to open at 10 a.m. instead of 1 p.m., after monitoring officials noted the frequency and time of day the pool had to be closed because of nearby lightning strikes.