CREATE TABLE table_11810 ("Season" FLOAT, "Grand FinalDate" TEXT, "WinningTeam" TEXT, "Score" TEXT, "LosingTeam" TEXT, "Location" TEXT, "GF Attendance" FLOAT, "Clive Churchill Medal" TEXT)

What is the grand final date for the game with a score or 30-24?
SELECT "Grand FinalDate" FROM table_11810 WHERE "Score" = '30-24'
SELECT "Grand FinalDate" FROM "table_11810" WHERE "Score" = '30-24'