Scientists are saying the sun is going to come out. It has been 7 years of rain with no sun at all. The teacher gives them their sun kits and tells them how to use them.
The kids tease Margot and tell her the sun isn't going to come out, and they shove her in the closet as a joke.
Middle of "All Summer in a Day"
The kids see the sun so they run outside, completely forgetting about Margot.
End of "All Summer in a Day"
The kids run for over an hour enjoying the sun untill they feel the rain coming back. They start to cry and go back to their school. When they remember Margot, they all feel very bad about themselves and guilty.