CREATE TABLE table_61212 ("Date" TEXT, "Series" TEXT, "Circuit" TEXT, "City / State" TEXT, "Winner" TEXT, "Team" TEXT)

Which circuit was the atcc round 7 at?
SELECT "Circuit" FROM table_61212 WHERE "Series" = 'atcc round 7'
SELECT "Circuit" FROM "table_61212" WHERE "Series" = 'atcc round 7'