CREATE TABLE table_64581 ("Wager" CLOB, "Winner" CLOB, "Loser" CLOB, "Location" CLOB, "Date" CLOB)

What is the date of the match where vampiro was the winner in Mexico City?
SELECT "Date" FROM table_64581 WHERE "Location" = 'mexico city' AND "Winner" = 'vampiro'
SELECT "Date" FROM "table_64581" WHERE "Location" = 'mexico city' AND "Winner" = 'vampiro'