Well, you'll get many answers if you read books about Kwanzaa. For example, in James C. Anyke's book African American Holidays, he states that the extra "a" was added "to distinguish this celebration as an African American Holiday." Furthermore, The Children's Book of Kwanzaa by Dolores Johnson elucidates that the extra 'a' was added "to give the holiday greater significance." After reading and analyzing several different explanations, I decided to directly approach the source. Therefore, I reviewed the books written by Dr. Karenga on the origins of Kwanzaa. According to those sources, I discovered that the extra "a" was attributed to the fact that Dr. Karenga wanted all seven children present at the first Kwanzaa to participate in the program.
Moreover, uncovering these facts inspired me to write a picture book: Kwanzaa Gets an A. Using Dr. Karenga's book as a guide, Kwanzaa Gets An A narrates the story about the manner in which the name of the holiday came into existence using a griot, an African storyteller. Consequently, the book was written to be an interactive experience where children participate, call and respond. Put succinctly, as the griot tells the story of Kwanzaa Gets an A, the children respond Ashe (ah-Shay), a West African word that means to bring about change.