CREATE TABLE table_32879 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What day did the VFL pay MCG?
SELECT "Date" FROM table_32879 WHERE "Venue" = 'mcg'
SELECT "Date" FROM "table_32879" WHERE "Venue" = 'mcg'