CREATE TABLE table_56504 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

How many people in total have attended games at Kardinia Park?
SELECT SUM("Crowd") FROM table_56504 WHERE "Venue" = 'kardinia park'
SELECT SUM("Crowd") FROM "table_56504" WHERE "Venue" = 'kardinia park'