CREATE TABLE table_204_780 (id DECIMAL, "year" DECIMAL, "competition" TEXT, "venue" TEXT, "position" TEXT, "notes" TEXT)

what venue was the first olympic games held in 1984 ?
SELECT "venue" FROM table_204_780 WHERE "competition" = 'olympic games' AND "year" = 1984
SELECT "venue" FROM "table_204_780" WHERE "competition" = 'olympic games' AND "year" = 1984