Northumbria Police said it expected the event to pass off peacefully, while admitting the Woolwich murder may have "heightened community concerns".
It has also held that materiality of contingent or speculative events or information depends on balancing the probability that the event will occur and the expected magnitude of the event.
About 85, 000 people are expected at the event, held at Balado in Perth and Kinross.
More than 140, 000 people, many of them elderly, are expected for the event.
Organizers say about 20, 000 people were expected for the event, a larger-than-normal crowd because Groundhog Day falls on a weekend this year.
Sir Chris Hoy will be awarded the freedom of Edinburgh later this month when thousands are expected for an event to welcome back the city's Olympic and Paralympic stars.
It is expected that this event would not only help build partnerships between institutions in Africa, the UK and Ireland, but also provide opportunities for collaborative research and academic exchange.
More than 100, 000 people are expected at the event.
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The event is expected to bring tens of thousands of people to Cali and Medellin.
Others expected to attend the event include model Lily Cole and Sir Tim Berners-Lee.
Five hundred people are expected to attend the event on Sunday called Y Bont (The Bridge).
Taoiseach Mr Ahern and former senator George Mitchell are expected to attend the event in Dublin Castle.
But the crowd around the event is expected to be smaller this time.
The organisers of a Portsmouth tattoo convention say the event is expected to attract 2, 000 people to the South Parade Pier.
The 2003 event is expected to be held in Welshpool, mid Wales.
The four-day star-studded event is expected to attract 28, 000 visitors and will be broadcast to a global audience of nearly 500 million in 110 countries.
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Besides these pressures, a once-in-a-lifetime event is expected to bring many companies to their knees and force a technology shift of unprecedented size and scope.
This year, the event is expected to attract 35, 000 rollers.
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The event is expected to enrich current debates about the implementation of the World Heritage Convention, which will soon see the inscription of the 1000th site on its List.
If a very bad event is expected every 100 years, instead of, say, every 133 years, he calculates that the real rate of return on 'safe' bonds could fall from 3.7 per cent to 2.3%.
"It can be valuable to identify situations where there is a significantly lower likelihood of an event than expected by experts based on the large set of observations and feeds being considered in an automated manner, " it said.
Now in its fifth year, the non-competitive event had been expected to attract about 2, 000 people on both Saturday and Sunday.
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Up to 10, 000 Gypsies and travellers are expected to attend the annual event, at Appleby, with many arriving in traditional bow-top wagons.
Both organisations said they still expected to benefit from the event.
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The storm isn't expected to be the epic event of last week, which dropped up to 3 feet of snow on some areas and knocked out power to hundreds of thousands of utility customers.
Prince William has announced his engagement to Kate Middleton, setting the stage for a royal wedding expected to be the biggest event of its kind since the wedding of Prince Charles to Lady Diana Spencer nearly 30 years ago.
In fact, close to 70 billionaires from 20 countries were expected to attend the invitation only event this year.
More than 24, 000 visitors are expected at Perthshire Big Tree Country event during its 23 night run in Pitlochry.
The 25-year-old had been expected to perform at the annual event in California, alongside Sir Paul McCartney and The Killers.
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