Based on the clue 'april 20 may 20 quick decisions are necessary b...', what is the answer?

What is associated with: april 17 1928 this author grits teeth beds nurse fights in war sits at bar remembers nurse? What is associated with: april 18 commemorates the day in 1980 when this country became zimbabwe? What is associated with: april 19 1956 he takes a gamble in monte carlo makes american movie star his bride? What is associated with: april 2 1990 hollywood stars protest this pesticide which comes in on medfly wings and a spray… What is associated with: april 21 is a rastafarian holiday its the date in 1966 when haile selassie visited this island? What is associated with: april 22 is earth day the birthday of this leader of the 1917 russian revolution? Based on the clue 'april 22 this secy of state says that the us seeks...', what is the answer? Based on the clue 'april 24 nearly 100 years old this legend of cos...', what is the answer?