CREATE TABLE table_46812 ("Event" TEXT, "Date" TEXT, "Rating" TEXT, "Share" TEXT, "Viewers" TEXT)

What is Event, when Date is April 20, 2013?
SELECT "Event" FROM table_46812 WHERE "Date" = 'april 20, 2013'
SELECT "Event" FROM "table_46812" WHERE "Date" = 'april 20, 2013'