The San Francisco North and East Bay region of the Society of Children’s Book Writers and Illustrators had asked me to teach a workshop on plot for their Contra Costa County Meeting in Walnut Creek. Sixty people signed up, all children’s writers eager to hone their writing skills and improve their craft. Now, I love teaching, but when the room is filled with people who simply love what they are doing, people who are dedicated to and persevering in their dream to become better writers, my heart leaps. Yesterday was such a joyful day.   I set out to show how plot structure formats — and there are so many out there that a web search brings you 3.000.000 results in 0.76 seconds! —…