Environment agencies in Scotland and England are advising people to keep up-to-date for the possible risk of flooding in low lying areas.
They say there is a low risk of flooding in parts of the Scottish Borders and Cumbria but motorists are also warned of standing water in places.
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More than 8,000 people are expected to attend over the three day event, which starts at 7pm tonight.
The local MP and leader of the Liberal Democrats says it was a "joyful" day for locals and former locals alike.
Detectives say the men have shown "no remorse for their actions whatsoever".