If the teacher wanted a symbol of harvest, then your son should have brought in a reproduced box of laborer's home brew!They already "celebrate" Kwanza. My first-grader in Frisco ISD, neighboring Plano, was told to make some symbol related to Kwanza in class. The teacher told them it was an ancient Southern African custom to celebrate the harvest. Needless to say, we raised a stink and he was excused from having to do it.
LOL An ancient South African custom??? I hope your son laughed. I sure would and I'm not even South African.
If the teacher wanted a symbol of harvest, then your son should have brought in a reproduced box of laborer's home brew!