CREATE TABLE table_28957 ("Rd." CLOB, "Circuit" CLOB, "City / State" CLOB, "Date" CLOB, "Championship" CLOB, "Challenge" CLOB, "Production" CLOB)

Which circuit was held on 25 28 march?
SELECT "Circuit" FROM table_28957 WHERE "Date" = '25–28 March'
SELECT "Circuit" FROM "table_28957" WHERE "Date" = '25–28 March'