CREATE TABLE table_55636 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What date did the home team Richmond play?
SELECT "Date" FROM table_55636 WHERE "Home team" = 'richmond'
SELECT "Date" FROM "table_55636" WHERE "Home team" = 'richmond'