What is the average attendance for all events held at Palmerston Park venue?
CREATE TABLE table_45890 (
    "Date" text,
    "Opponent" text,
    "Venue" text,
    "Result" text,
    "Attendance" real
)
SELECT AVG("Attendance") FROM table_45890 WHERE "Venue" = 'palmerston park'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the average attendance for all events held at Palmerston Park venue? ### Input: CREATE TABLE table_45890 (
    "Date" text,
    "Opponent" text,
    "Venue" text,
    "Result" text,
    "Attendance" real
) ### Response: SELECT AVG("Attendance") FROM table_45890 WHERE "Venue" = 'palmerston park'