What is the lowest number of points scored when there were 1,500 in attendance?
CREATE TABLE "regular_season" (
  "date" text,
  "visitor" text,
  "score" text,
  "home" text,
  "decision" text,
  "attendance" text,
  "record" text,
  "points" real
);
SELECT MIN("points") FROM "regular_season" WHERE "attendance"='1,500';