Really? Their box office must get awfully fed up with fielding enquiries as to what purple team etc means.
I used to work in a theatre. Nobody attending is in the slightest bit interested in which random children are performing other than their families, and parents/carers will of course already know their itinerary. It's utterly meaningless to most patrons and would be crackers to publicly advertise, causing confusion when booking and so more work for staff.