CREATE TABLE table_74827 ("Res." TEXT, "Record" TEXT, "Opponent" TEXT, "Method" TEXT, "Event" TEXT, "Round" FLOAT, "Time" TEXT, "Location" TEXT)

Which event had an opponent of Yasuhito Namekawa with a decision method?
SELECT "Event" FROM table_74827 WHERE "Opponent" = 'yasuhito namekawa' AND "Method" = 'decision'
SELECT "Event" FROM "table_74827" WHERE "Method" = 'decision' AND "Opponent" = 'yasuhito namekawa'