What is the highest numbered event?
CREATE TABLE "table1_30060356_3" (
  "event" real,
  "circuit" text,
  "gt3_pro_cup_winner" text,
  "gt3_pro_am_cup_winner" text,
  "gt3_citation_cup_winner" text,
  "gt4_cup_winner" text
);
SELECT MAX("event") FROM "table1_30060356_3";