CREATE TABLE table_56864 ("Race Name" TEXT, "Circuit" TEXT, "Date" TEXT, "Winning driver" TEXT, "Constructor" TEXT, "Report" TEXT)

On what date was the I Dessau Autobahnspinne race?
SELECT "Date" FROM table_56864 WHERE "Race Name" = 'i dessau autobahnspinne'
SELECT "Date" FROM "table_56864" WHERE "Race Name" = 'i dessau autobahnspinne'