Tom Jones fans spent hours queuing for his show at Holkham Hall after a crash at Fakenham left roads gridlocked.
The incident happened on the B1105 near Fakenham at about 5.15pm on Sunday night.
Queues quickly built, with fans spending hours behind the wheel as they inched their way to north Norfolk - with one couple taking four hours to travel from Swaffham to Holkham.
Despite Tom Jones' appearance being pushed back from 8.30pm to 8.40pm, some missed the beginning of the show and a handful decided to head home instead of waiting. Holkham Hall said at 9.15pm that everyone had made it into the show.
Clare Spalding tweeted to say that she had managed to move just two miles in two hours.
MORE: Sir Tom Jones showed no signs of slowing down at Norfolk gig
Mike Ryan posted: 'Been stuck for one hour without moving waiting to get to Tom Jones.'
Debbie Simpson said: '2 1/2 hours sat in traffic to get to Tom Jones for husband's 50th birthday treat. No information no marshals. Don't let the concert start.'
Peter Layzell and his partner Rebecca Waldron drove up from Hertfordshire, and arrived at the crash scene just after it happened.
'We turned around and followed other cars and, at 8pm we were still waiting about 1.4 miles away from Holkham,' he said.
'It was just stationary. We didn't see police, marshals, or signs - it seemed like there was really bad organisation.'
He said the couple, who travelled up with Miss Waldron's parents, would expect a refund if they missed the main show.
Police were on scene and have advised people not attending the concert to avoid the area.
Fire crews from Wells and Fakenham were called to the crash, where they provided casualty care. It is not yet clear how many people were injured or the severity of their condition.
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