WHEN EIGHT OF THE world’s most accomplished performers gathered in one place on Nov. 14 for THR’s annual Actress Roundtable, you might have expected some backstage drama. Sure, there was a slight kerfuffle over whether their stylists should be allowed on-set, and then there was a major case of hunger pangs when new mom Carey Mulligan, 30, and newly-in-from-China Jennifer Lawrence, 25, both had to wolf down bananas before the shoot. But other than that, it was a lovefest as the two actresses joined Cate Blanchett (Carol, Truth), 46; Jane Fonda (Youth), 77; Brie Larson (Room), 26; Helen Mirren (Trumbo, Woman in Gold), 70; Charlotte Rampling (45 Years), 69; and Kate Winslet (Steve Jobs), 40, in a discussion that ranged from the pay gap between men and women to the…