My son was in a school play last week, and my daughter was in one today. Both were the kind of effort where the whole class participates. My son goes to a larger Montessori school (which goes through eighth grade) and the music teacher directed the middle school students in a very professionally-done play. My daughter goes to a more purist Montessori school, where the senior elementary (4th-6th grade kids) wrote and put together their own play with no adult help. They didn't even have help from parents with costumes. Very different experiences, and I'm not sure which one taught the kids more.
I'm going to the convent for the weekend.