CREATE TABLE table_20724 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Ground" TEXT, "Crowd" FLOAT, "Date" TEXT)

Name the date for richmond
SELECT "Date" FROM table_20724 WHERE "Away team" = 'Richmond'
SELECT "Date" FROM "table_20724" WHERE "Away team" = 'Richmond'