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The big day had come at last. Mrs. Hockenberrys' third grade class waited quietly for her to come into the room. They had planned the party a week ago. Today Amy brought the cupcakes, Joey brought the napkins, Carlos brought the soda, and Katie brought the cups. Everyone wanted the party to be a surprise. Mrs. Hockenberry did not know the children knew it was her birthday. When she came back into the room, the children shouted, "Happy Birthday, Mrs. Hockenberry!"
What is the main idea of this paragraph?
The class was throwing Mrs. Hockenberry a surprise birthday party.