10am - 4pm. The Ohio Glass Museum is offering an opportunity for children ages 7-14 to participate in a county-wide MARBLES TOURNAMENT. WHERE: Rising Park tennis courts (Ohio Glass Museum is alternative site for bad weather.) A National Tournament representative will be directing 2 FREE Marbles Teaching Sessions to those boys and girls that have registered in order to help develop and improve their marble shooting skills. These sessions will be held at the Ohio Glass Museum (Saturday, April 14 & Saturday, April 28 from 10:00 a.m. - noon). Registration is required please call. One winning boy and girl from the local tournament will be eligible to compete in the National Marbles Tournament to be held in Wildwood, New Jersey (June 17-21).