SELECT "Date" FROM table_4711 WHERE "Home team" = 'geelong'
When did Geelong play as the home team?
CREATE TABLE table_4711 (
    "Home team" text,
    "Home team score" text,
    "Away team" text,
    "Away team score" text,
    "Venue" text,
    "Crowd" real,
    "Date" text
)