CREATE TABLE table_70012 ("Date" TEXT, "City" TEXT, "Country" TEXT, "Venue" TEXT, "Attendance" TEXT)

When is Country of united states, and a Venue of mandalay bay resort in?
SELECT "Date" FROM table_70012 WHERE "Country" = 'united states' AND "Venue" = 'mandalay bay resort'
SELECT "Date" FROM "table_70012" WHERE "Country" = 'united states' AND "Venue" = 'mandalay bay resort'