What is the date of the k-league cup, which has less than 28 goals, at the jeonju venue?
CREATE TABLE "members" (
  "name" text,
  "date" text,
  "goals" real,
  "assists" real,
  "team" text,
  "venue" text,
  "opponent" text,
  "competition" text,
  "total_gs" real,
  "total_as" real
);
SELECT "date" FROM "members" WHERE "venue"='jeonju' AND "goals"<28 AND "competition"='k-league cup';