CREATE TABLE table_70356 ("Res." TEXT, "Record" TEXT, "Opponent" TEXT, "Method" TEXT, "Event" TEXT, "Round" FLOAT, "Location" TEXT)

Which event led to a 4-0 record?
SELECT "Event" FROM table_70356 WHERE "Record" = '4-0'
SELECT "Event" FROM "table_70356" WHERE "Record" = '4-0'