They meet other children. They learn to participate in a group. Parents enjoy several advantages when their children participate in a mini-school. They can avoid homeschool burnout and enjoy a change of pace. They may pursue personal interests.
Some parents use that time for focused attention for another child.
If their own children participate, the family benefits twice. Teachers with a passion for a field can share that passion with others. Except for the fact that the sponsor is paid, many of the benefits are identical. Yet key differences bear consideration. The first is the general enrichment program that I ran.