TODAY is the main event of the 2019 Nato summit in Watford.

Here's everything you need to know, including the venue, attendees and road closure information.

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The main event takes place today, Wednesday, December 4.

Politicians from around the world arrived on Tuesday, December 3, for the talks.

2019 marks the 70th anniversary of the alliance's meetings.

The North Atlantic Treaty Organisation (Nato), started out in 1949 with just 12 countries as members.

FULL ITINERARY FOR WEDNESDAY, DECEMBER 4

The Nato 2019 summit is being held in Watford, Herts.

Some of the world's most important leaders are meeting at The Grove Hotel at Chandler's Cross.

Nato summits are a periodic opportunity for Heads of State and Heads of Government to meet and evaluate Nato's current strategies, evaluate the alliance's current position and brainstorm strategic direction.

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Donald Trump touched down in the UK on Monday, December 2, ready to attend the summit.

He was met by protesters ahead of an event at Buckingham Palace the following evening where he and other leaders were greeted by the Queen and Prince Charles.

The leaders met at the palace to mark 70 years of the alliance.

FULL LIST OF ATTENDING MEMBER COUNTRIES

The summit's main event is the Nato leader's meeting.

The alliance includes 28 member states,with countries including Germany, Spain, Greece and Turkey joining, andrepresents a population of more than 900 million people.

The organisation isconsidered to be thelargest and most powerful military alliance in history.

Attending the meeting in Hertfordshire will be Donald Trump, who is visiting the UK during the first week of December.

According to the BBC: "President Trump will have separate talks with German Chancellor Angela Merkel, French President Emmanuel Macron and Nato Secretary General Jens Stoltenberg and attend a working lunch with representatives from Estonia, Greece, Latvia, Poland, Romania, Lithuania, Bulgaria, and the United Kingdom."

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The summit will see heightened security, road closures and traffic - with police warning of significant disruption.

Nato, or the North Atlantic Treaty Organisation, is an intergovernmental military alliance established in 1949.

It was formed with the signing of the North Atlantic Treaty in 1949 by 12 member states - Belgium, Canada, Denmark, France, Iceland, Italy, Luxembourg, the Netherlands, Norway, Portugal, the UK and the US.

Since then it has expanded to 28 member states,with countries including Germany, Spain, Greece and Turkey joining, andrepresents a population of more than 900 million people.

The organisation isconsidered to be thelargest and most powerful military alliance in history.

Heads of government and state have met at 26 Nato summits since 1949 - the one before Watford's was held in Poland.

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Nato summit 2019 Watford where is The Grove Hotel and which member countries are attending? - The Sun