More than 150 presidents, prime ministers and heads of state are converging on New York for what is being billed as the largest gathering of world leaders in history. Diplomats say the high-level event at United Nations headquarters beginning Wednesday may not meet the lofty goals set out by Secretary-General Kofi Annan. Talks on a summit outline document have been going on for months, but negotiators are said to be making deletions where no agreement has been reached. Negotiators say the last-minute talks are focusing on reforming the widely-criticized Human Rights Commission, new responsibility for governments to protect civilians from genocide and nuclear non-proliferation. Before a closed-door meeting with President Bush Tuesday, Mr. Annan told reporters he was confident negotiators would produce a document for all 191 member states to sign before Friday's conclusion of the summit.