It looks a little like an accordion playing from a distance; the group expands and contracts with great regularity though in a totally chaotic fashion.
When Ontario was a manufacturing giant, before it was dismantled in the late 90s by Harris, this kind of family grouping would happen naturally with the plant shutdowns for 2 weeks each summer when everyone was off and the plant was retooled. The farther south the manufacturing plants were, the earlier in the summer were the shutdowns. Mix that with the youngest employees from other sectors getting the earliest vacations in the summer schedule, and week by week there would be large groups of children with their respective adults. Activites didn't organize officially, but there was a lot of parents cooperating to have great vacations with their broods.
Not so much now that so many people apparently don't vacation. The labour sectors don't support the same kind of tourist flow either.
There have been family reunions here the same size as Campapalooza.
These ladies are on to something. 4 nights of overnight camp for 21 youngsters of different ages? A quick calculation says they saved about $12K giving their children a camp experience the Campapalooza way.