CREATE TABLE table_77829 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

When was the game with richmond as Away team?
SELECT "Date" FROM table_77829 WHERE "Away team" = 'richmond'
SELECT "Date" FROM "table_77829" WHERE "Away team" = 'richmond'