If you'd like to know more about Kwanzaa, you can read The Complete  Celebrating our Cultural Harvest , by Dorothy Winbush Riley; A Kwanzaa  Celebrating the Holiday With New Traditions and Feasts , by Jessica B. Harris; or Merry Christmas,  A Christmas and Kwanzaa Treasury , edited by Felix H. Liddell and Paula L. Woods.
Read the book I mentioned if you want to learn about Kwanzaa.