Adrian Harms
BBC Surrey

The London Philharmonic Orchestra is now performing at Runnymede.

And there's not a spare seat in the house.

Phil Coomes
Picture editor

Back to the Runnymede eco-village where photographer Daniella Zalcman stumbled upon the group in February this year, and, after a few phone calls, began to visit every week or so.

Image source, Daniella Zalcman

Here's a photo she took of a sign on the fence that surrounds the community.

"Does Magna Carta mean nothing to you? Did she die in vain?" asked an exasperated Tony Hancock playing the jury foreman in an episode of his famous Half Hour.

BBC legal correspondent Clive Coleman writes: "Clearly not. Far from dying, Magna Carta has had a life longer, fuller and more influential than the most optimistic medieval baron could have imagined."

Lots of Magna Carta jokes on twitter. For a light-hearted approach see these tweets.

Tony Munky wrote, external: "Can't believe it has been 800 years since the Magna Carta was signed - only feels like yesterday! #magnacarta"

Image source, Getty Images

And lots of jokes about ice cream. One here, external from Pongo The Penguin: "@mrchrisaddison Magna Carta? I thought that was an expensive ice cream with raspberry in it"

It's not just Runnymede that is marking 800 years of Magna Carta though, events are taking place all over the country.

Take a look at this light installation at Salisbury Cathedral.

Image source, Getty Images

It has about 6,000 colour-changing light bulbs suspended from the ceiling to celebrate the 800th anniversary.

Today's event will include speeches by the Archbishop of Canterbury Justin Welby and Lord Dyson, Master of the Rolls.

And the Queen will unveil a plaque at the memorial to mark the occasion.

BBC Surrey is at Runnymede meadow and broadcasting live throughout the morning. Listen here.

The river is closed for today's ceremony - not just the roads.

The A308 Windsor Road which runs alongside the meadow will remain shut until late afternoon, as will the section of the River Thames that runs through Runnymede.

For more details, see this information from the National Trust, external and Surrey County Council, external.

In the run up to the anniversary celebrations, BBC Surrey asked a few people around the county if they knew what Magna Carta was.

One woman said: "Didn't that happen in 1066 in Hastings?" Another said: "Wasn't it the Domesday Book?"

Someone speculated that it might have been a document signed somewhere between 1400 and 1600. If you're stuck, look at BBC iWonder.

Briony McDonagh has tweeted, external: "Runnymede Eco Village residents in court over eviction proceedings on the day of the #MagnaCarta celebrations in the field next door"

And she posted, external: "Someone, somewhere has a magnificent sense of historical irony #MagnaCarta #MagnaCarta800 #freetheland"

That hearing begins at 10:30 BST. We might find out the outcome while the ceremony is under way.

We're waiting for the national Magna Carta Foundation of Liberty ceremony to get under way at 09:00 BST.

Invited guests include members of the Royal Family and dignitaries from the UK and around the world.

More than 4,000 people are gathering on the normally tranquil meadow.

William Hubbard, president of the American Bar Association, external which put up the Magna Carta memorial in 1957, is at the celebrations. He said: "We could not be more excited. We are thrilled."

He said about 900 ABA members had come over to the UK to celebrate Magna Carta.

"It's the foundation of American democracy. It's absolutely the foundation of our country."

National Trust director Dame Helen Ghosh loves how the chairs represent all eras and all continents in terms of liberty and the rule of law.

She says: "They're so intricate. The amount of time you could spend just gazing at the design is wonderful."

And here's the first view of Hew Locke's artwork - inspired by Magna Carta's principles of justice.

Image source, Tom Morgan

It shows 12 chairs arranged in a square - and it's called The Jurors.

Sister Catherine Wybourne has tweeted, external: "I hope all those writing about Magna Carta today have actually read it.

"Sometimes one gets the impression some haven't. #MagnaCarta"

Image source, British Library

If you're not in a position to read the original medieval Latin on parchment, there are some handy translations around.

Here's one from the British Library, external, but remember it was amended and edited over the years.

Jack Fiehn
BBC Surrey Political Reporter

All around me preparations are taking place for the main event in a few hours time.

There are tents all around the field and a huge stage with seats in front of it.

That's where the Queen and other members of the Royal Family will be later on this morning for speeches and music.

The National Trust has tweeted a picture of the first guests arriving - under overcast skies although the weather is expected to brighten later.

Image source, National Trust

The organisation wrote: "And so it begins... #MagnaCarta800, external"

Tanya Gupta
BBC News

Welcome to our live page marking the 800th anniversary of the Magna Carta.

I'll be bringing you all the latest from the ceremony at Runnymede, where thousands of people including the Queen are gathering to mark the event.

You can tweet us @BBCSurrey, external and email us your pictures and comments.