Once a year, the world’s leaders descend on New York for the UN’s blue ribbon event, the cumbersomely-titled UN General Assembly’s General Debate.

This year, the build-up has been dominated by the Palestinian Authority’s planned bid to become the 194th member of the UN, following South Sudan’s incorporation earlier in the year.

Notwithstanding any last minute deals, Palestinian Authority President Mahmoud Abbas will personally submit the application to Secretary-General Ban Ki-moon on Friday, September 23, after Abbas has delivered his speech to assembled leaders.

Indeed, Friday’s session is set to be a cracker, since it also features Israeli Prime Minister Benyamin Netanyahu’s speech, in which he must surely address the issue. And yet while the Palestinian membership-issue is grabbing all the headlines, there’s plenty of other highlights.

Ahead of the formal UNGA opening today, there was a high-level meeting on Libya yesterday, the first since the UN formally recognised the Transitional National Council as the official representative of Libya last Friday. 

US President Barack Obama met privately for the first time with TNC Chairman Mustafa Abdel Jalil, and held separate summits with President Hamid Karzai before he returned to Aghanistan to join the mourning of the assassinated leader Burhanuddin Rabbani.

Tuesday also saw French Foreign Minister Alain Juppe host a ministerial-level meeting of the so-called Deauville Partnership, a G20-offshoot dedicated to supporting fledgling Arab democracies.

The Debate kicks off today with an address by the Brazilian President, the first for Dilma Rousseff since she took office in January and no doubt a welcome relief from domestic troubles.

A notable absence, though, is Russian leader Dmitry Mevedev, who has chosen to delegate responsibilities this year to Foreign Minister Sergey Lavrov.

In the afternoon South Africa’s Jacob Zuma will be speaking. On Thursday morning, Mahmoud Ahmadinejad gives his traditionally polemical speech (who can forget last year, when he alluded to the 9/11 attacks being a conspiracy). British Prime Minister David Cameron also speaks that session.

Highlights from the afternoon session on Thursday include an inaugural address by newly-elected Peruvian President Ollanta Humala, an address from ageing despot Robert Mugabe, and also remarks from Turkish Prime Minister Recep Tayyip Erdogan, whose star is in the ascendancy amid Turkey’s role in the Arab Spring.

On the sidelines that day, UN Secretary General Ban Ki-moon is hosting a UN High-Level Meeting on Nuclear Safety and Security, likely to focus significantly on lessons to be learned from the crisis at Japan’s Fukushima Daiichi plant back in March. Friday, as we’ve seen, is all about the Palestinian-membership issue.

But in the morning there is also a first-time address from new Japanese Prime Minister Yoshihiko Noda , who is expected to put in appearance also at the nuclear safety meeting. That afternoon South Sudanese President Salva Kiir – who meets one on one with President Obama earlier in the week – will give his country’s address for the first time since it became member number 193 last July

Sadly, one of the traditionally more entertaining speakers – Venezuela’s Hugo Chavez – is not expected to make the journey to New York this time, as he is recovering from a fourth round of chemotherapy for cancer discovered earlier in the year.

By Nicole Hunt

This week is filled with high-profile trials and judgements around the world, kicking off on Monday with six big-name hearings, including several former world leaders: ousted Egyptian President Hosni Mubarak, his sons and former Interior Minister Habib Al Adly are all on trial over protester deaths in Cairo; former French President Jacques Chirac’s corruption trial resumes in Paris; former Icelandic Prime Minister Geir Haarde’s trial for negligence over the country’s banking collapse starts in Reykjavik; former Slovenian Prime Minister Janez Jansa’s ‘Patria’ corruption trial begins in Ljubljana; Rwandan opposition leader Victoire Ingabire goes on trial in Kigali for promoting genocide; and Sizwe Mankazana, who was driving the car which crashed and killed Nelson Mandela’s great-granddaugther on the eve of last year’s World Cup faces the court in Johannesburg.

The focus is on austerity in Europe on Tuesday, as Italy braces for a general strike over debt-cutting measures proposed by Silvio Berlusconi’s government.

In Berlin, the German government begins a four-day debate of its 2012 budget. Wednesday’s general debate with Chancellor Angela Merkel coincides with the country’s Contitutional Court’s decision on a constitutional challenge to a May 2010 law guaranteeing the maintenance of Greece’s financial stability and solvency, authorising up to €22.4bn in loans.

In Algiers, the Algerian government hosts a two-day conferennce on regional security, focusing on the threat from Al Qaeda in the Islamic Maghreb.

Back to the Paris courts on Thursday, where the verdict is expected in the trial of disgraced fashion designer John Galliano, who is accused of hurling anti-Semitic abuse at a member of the public in February.

Meanwhile, a hearing is scheduled to formalise the extradition of former Panamanian leader Manuel Noriega, who was convicted of money laundering last summer and sentenced to seven years in prison. He is expected to be sent back to Panama, where he has been sentenced in absentia to 60 years in prison for human rights violations committed between 1983 and 1989.

G7 Finance Ministers begin a two-day meeting in Marseille on Friday. Officials from the EU, IMF and World Bank also attend to discuss issues ahead of the IMF/World Bank annual autumn meetings later this month.

The Rugby World Cup kicks off in Auckland with New Zealand v Tonga. The tournament runs until 23, October.

Greek Prime Minister George Papandreou delivers his annual economic address at the Thessaloniki Trade Fair on Saturday. Unions and activists plan to hold demonstrations outside the fair, protesting against the government’s austerity measures.

Sunday marks the 10th anniversary of the 11 September, 2001 attacks on the United States. President Barack Obama and former President George W Bush are among those attending a memorial service at Ground Zero, which begins at 8:40am EDT to mark the time the first plane hit the North Tower of the World Trade Centre.

While all eyes are on the US, Guatemalans will quietly elect a new President. A planned bid by Sandra Torres, ex-wife of current President Alvaro Colom, was ruled unconstitutional. The couple divorced to enable Torres to run, hoping to circumvent a law that ruled the President’s spouse ineligible.