CREATE TABLE table_204_691 (id DECIMAL, "date" TEXT, "round" TEXT, "opponent" TEXT, "venue" TEXT, "result" TEXT, "attendance" DECIMAL, "scorers" TEXT)

on which did date their game have the least people in attendance ?
SELECT "date" FROM table_204_691 ORDER BY "attendance" LIMIT 1
SELECT "date" FROM "table_204_691" ORDER BY "attendance" NULLS FIRST LIMIT 1