CREATE TABLE table_35339 ("Race Title" TEXT, "Circuit" TEXT, "Location / State" TEXT, "Date" TEXT, "Winner" TEXT, "Team" TEXT)

Which Location/ State has a Date of 29 31 may?
SELECT "Location / State" FROM table_35339 WHERE "Date" = '29–31 may'
SELECT "Location / State" FROM "table_35339" WHERE "Date" = '29–31 may'