CREATE TABLE table_21645 ("Team" TEXT, "Head coach" TEXT, "Team captain" TEXT, "Venue" TEXT, "Capacity" FLOAT, "Kitmaker" TEXT, "Shirt sponsor" TEXT, "Club Chairman" TEXT)

Which venue does Mardan sponsor?
SELECT "Venue" FROM table_21645 WHERE "Shirt sponsor" = 'Mardan'
SELECT "Venue" FROM "table_21645" WHERE "Shirt sponsor" = 'Mardan'