CREATE TABLE table_74797 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

When did the match take place that had a home team score of 7.9 (51)?
SELECT "Date" FROM table_74797 WHERE "Home team score" = '7.9 (51)'
SELECT "Date" FROM "table_74797" WHERE "Home team score" = '7.9 (51)'