Wake Forest University spokeswoman Katie Neal said Friday that Clinton will attend the event honoring Angelou on the Winston-Salem, N.C., campus where she taught for more than 30 years.
Oprah Winfrey Network spokeswoman Chelsea Hettrick said the TV talk-show host and producer also will attend Saturday's memorial.The White House said Mrs. Obama will deliver remarks.
Angelou died last week at her Winston-Salem home at age 86. She was known worldwide as a literary pioneer and civil rights champion.
Saturday's service is closed to the public. Wake Forest says it will stream the memorial event online.