CREATE TABLE table_54206 ("Record" TEXT, "Date" TEXT, "Driver" TEXT, "Time" TEXT, "Speed/Avg. Speed" TEXT)

When was the race that set the record for the Izod Indycar Series?
SELECT "Date" FROM table_54206 WHERE "Record" = 'izod indycar series'
SELECT "Date" FROM "table_54206" WHERE "Record" = 'izod indycar series'