CREATE TABLE table_45431 ("Date" TEXT, "H/A/N" TEXT, "Opponent" TEXT, "Score" TEXT, "Record" TEXT)

What is H/A/N, when Date is October 31?
SELECT "H/A/N" FROM table_45431 WHERE "Date" = 'october 31'
SELECT "H/A/N" FROM "table_45431" WHERE "Date" = 'october 31'