CREATE TABLE table_name_70 (date VARCHAR, decision VARCHAR, attendance VARCHAR)

What was the date of the game with a decision of Lehtonen and attended by more than 17,731 people?
SELECT date FROM table_name_70 WHERE decision = "lehtonen" AND attendance > 17 OFFSET 731
SELECT "date" FROM "table_name_70" WHERE "attendance" > 17 AND "decision" = "lehtonen" OFFSET 731