They address the roles of leaders, leadership development, facilities, equipment, curriculum and other resources. Weekly Sunday schools often have uneven attendance. In the small-membership church where I worship, busy families might find it easier to block out half a day once a month than to get to Sunday school every week. The trick of course, is to offer high quality educational ministries for people of all ages. Learning theory affirms that taking time improves retention.
Teachers feel better about lessons prepared for people who actually show up.
Teachers may find it easier to plan lessons for longer sessions than for shorter ones. If the Saturday school includes some sort of snack break, creative work, mission activities, or recreational time, learning is reinforced. Multiple age grouping is easier to facilitate in bigger time blocks. Even if a church took the summer off, this model could provide twice as much time for quality Christian education than the average person gets in a year. Saturday Christian education does not have to replace a Sunday school, but it could supplement the church's educational ministries.