CREATE TABLE table_203_541 (id DECIMAL, "games" TEXT, "host city" TEXT, "dates" TEXT, "nations" DECIMAL, "participants" DECIMAL, "events" DECIMAL)

which olympics had the most participants ?
SELECT "games" FROM table_203_541 ORDER BY "participants" DESC LIMIT 1
SELECT "games" FROM "table_203_541" ORDER BY "participants" DESC NULLS LAST LIMIT 1