Historical clue formulations

• ___ Umbridge, teacher of Dark Arts at Hogwarts — 2016-06-19
• Actress-turned-nun Hart — 2012-02-25
• Actual name of Nabokov's Lolita — 2011-06-02
• 1941 #1 hit for Tommy Dorsey — 2009-07-10
• Del Rio of film — 2001-01-10
• Colorado tributary — 1995-10-15
• Mrs. Bob Hope — 1994-01-30