Tuesday + Substitute+tears=LONG DAY

So the day started out good. Mentor explained the whole day to me. Substitute showed up I explained the day to her.
Students come in complete their planners, then it's calendar time (usually 20 minutes)Then I had a pilgrim packet to finish with the students well the calendar time ended up taking 45 minutes. I improvised and finished the packet after recess and only got 2 letters finished in handwriting instead of 3. THe day continued in this way.

Tears- 2 boys who were frustrated=a lot of tears.

Questions: What ideas do people have for explaining Venn Diagrams to first graders? Because I am not sure if they completely grasped the concept with the manipulatives that we used...