CREATE TABLE table_6401 ("Result" TEXT, "Date" TEXT, "Race" TEXT, "Venue" TEXT, "Group" TEXT, "Distance" TEXT, "Weight  ( kg ) " FLOAT, "Time" TEXT, "Jockey" TEXT, "Winner/2nd" TEXT)

What was the date for the G1 group race at Flemington?
SELECT "Date" FROM table_6401 WHERE "Group" = 'g1' AND "Venue" = 'flemington'
SELECT "Date" FROM "table_6401" WHERE "Group" = 'g1' AND "Venue" = 'flemington'