CREATE TABLE table_56581 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

How big is the Venue of Brunswick Street Oval?
SELECT SUM("Crowd") FROM table_56581 WHERE "Venue" = 'brunswick street oval'
SELECT SUM("Crowd") FROM "table_56581" WHERE "Venue" = 'brunswick street oval'