CREATE TABLE table_1786 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Game site" TEXT, "Record" TEXT, "Attendance" FLOAT)

Where was the game where attendance was 51478?
SELECT "Game site" FROM table_1786 WHERE "Attendance" = '51478'
SELECT "Game site" FROM "table_1786" WHERE "Attendance" = '51478'