CREATE TABLE table_20781 ("Week" FLOAT, "Date" TEXT, "Kickoff" TEXT, "Opponent" TEXT, "Final score" TEXT, "Team record" TEXT, "Game site" TEXT, "Attendance" FLOAT)

What day(s) did they play on week 2?
SELECT "Date" FROM table_20781 WHERE "Week" = '2'
SELECT "Date" FROM "table_20781" WHERE "Week" = '2'