CREATE TABLE table_78091 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

On what date did the match at Lake Oval take place?
SELECT "Date" FROM table_78091 WHERE "Venue" = 'lake oval'
SELECT "Date" FROM "table_78091" WHERE "Venue" = 'lake oval'