CREATE TABLE table_54157 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

On what date was the venue VFL Park?
SELECT "Date" FROM table_54157 WHERE "Venue" = 'vfl park'
SELECT "Date" FROM "table_54157" WHERE "Venue" = 'vfl park'