When was the Kwanzaa feastival created by whom?

Maulana Ron Karenga(b. Ronald McKinley Everett, July 14, 1941) is the person responsible for the first kwanzaa, in 1966.

Specifically, the first celebration ran from the last week of December 1966 until New Year's Day 1967. Each year since, the event celebrates the African heritage of African-American communities in the United States of America. The celebrations always are held on the same date and in the same way each year. So the first celebration in 1966 was the beginning of a festive celebration that has become a traditional part of African-American culture.