Getting ready for an Oscars party? On Sunday, the 91st Academy Awards ceremony will air on ABC. Red carpet coverage will begin at 4 p.m. here and the ceremony will begin at 7 p.m.Use this tip sheet summarizing the eight Best Picture nominees to wow the other fete guests with your predictions:“Black Panther”“Black Panther” is the biggest-budget action movie ($200 million) ever to feature a black superhero, grossing more than $1.3 billion. Its setting is Wakanda, a high-tech African Arcadia, untouched …