CREATE TABLE "april" (
  "date" text,
  "visitor" text,
  "score" text,
  "home" text,
  "leading_scorer" text,
  "record" text
);

Question: What was the date of the game in which the home team was the Grizzlies and the visiting team was the Timberwolves?
SQL: SELECT "date" FROM "april" WHERE "home"='grizzlies' AND "visitor"='timberwolves';