CREATE TABLE table_45890 ("Date" TEXT, "Opponent" TEXT, "Venue" TEXT, "Result" TEXT, "Attendance" FLOAT)

What is the average attendance for all events held at Palmerston Park venue?
SELECT AVG("Attendance") FROM table_45890 WHERE "Venue" = 'palmerston park'
SELECT AVG("Attendance") FROM "table_45890" WHERE "Venue" = 'palmerston park'