What is the round or race of the winning driver Charles Hollings and what was his pole position?
CREATE TABLE "calendar" (
  "round_race" text,
  "circuit" text,
  "date" text,
  "pole_position" text,
  "fastest_lap" text,
  "winning_driver" text,
  "winning_team" text
);
SELECT "round_race" FROM "calendar" WHERE "winning_driver"='charles hollings' AND "pole_position"='charles hollings';