Harry Potter Class - For Ages 8 to 14 -- will be held in August at the Tioga County Historical Society & Museum, 110 Front Street, Owego.   30 seats available for this 2-day course (10:30 am to 3:30 pm).  Fee: $25.  Students bring their own bagged lunch and drink.  $10 non-refundable deposit.  Call the museum at (607) 687-2460 for further details.