CREATE TABLE table_32911 ("Home team" CLOB, "Home team score" CLOB, "Away team" CLOB, "Away team score" CLOB, "Venue" CLOB, "Crowd" FLOAT, "Date" CLOB)

On what date was a match held at MCG?
SELECT "Date" FROM table_32911 WHERE "Venue" = 'mcg'
SELECT "Date" FROM "table_32911" WHERE "Venue" = 'mcg'