Factbox: Key events disrupted by volcanic ash cloud over Europe

LONDON (Reuters) - The volcanic ash cloud that has turned much of northern Europe into a no-fly zone has also disrupted key economic and political events across the continent.

See below for major events that have been delayed or affected.

* A mission of European officials and the International Monetary Fund to Greece has been delayed and will begin work on April 21 if possible, Greece's Finance Ministry said.

It had been due to start work on Monday, when only some members of the IMF delegation had arrived in Athens.

Struggling under a huge budget shortfall and debt pile, Greece requested the talks with the European Union, the European Central Bank and the IMF last week to go over details of a potential aid deal agreed by euro zone states.

* The European Central Bank canceled plans to present its annual report, which it uses to review its activities over the previous year, at the European Parliament in Strasbourg.

The bank said it would publish the document on its Web site at 1730 GMT on Monday as planned.

* Sweden's central bank said governor Stefan Ingves would not be able to attend or vote at a monetary policy meeting on Monday.

Ingves had been due to fly back to Stockholm from Madrid, where he attended a meeting of European finance ministers, but had to take an embassy bus instead.

* French Economy Minister Christine Lagarde canceled a planned trip to N'Djanema on April 20 for a meeting of former French colonies that share the same "zone franc" currency.

* The Estonian central bank postponed the release of its Spring economic forecasts scheduled for Tuesday due to the absence of Central Bank Governor Andres Lipstok, who was also unable to return from Madrid.

* Many government heads and heads of state, including U.S. President Barack Obama, German Chancellor Angela Merkel and French President Nicolas Sarkozy, were unable to attend the state funeral of Polish President Lech Kaczynski on Sunday following his death in a plane crash in Russia.

(Edited by John Stonestreet)