CREATE TABLE table_16246 ("DVD Name" TEXT, "# of Ep" FLOAT, "Region 1" TEXT, "Region 2" TEXT, "Region 4" TEXT)

What date did the DVD for season six come out in region 2?
SELECT "Region 2" FROM table_16246 WHERE "DVD Name" = 'Season Six'
SELECT "Region 2" FROM "table_16246" WHERE "DVD Name" = 'Season Six'