The organisers of this weekend's Let's Rock Norwich! are advising people not to bring bags to the event 'unless absolutely necessary' due to heightened security measures.
Thousands of people are set to attend the retro festival at Earlham Park this Saturday for the inaugural event in city with acts including Tony Hadley, Bananarama and Howard Jones.
In a Facebook post organisers said: 'For your own safety and security, we advise customers not to bring bags in to Let's Rock Norwich unless absolutely necessary, as this will slow down your entry.
MORE: Let's Rock Norwich! 2017: Everything you need to know about the big day
'All bags will be thoroughly searched and customers will be subject to pat down and metal detector searches. Please be patient when entering the site and allow plenty of time to get into the show.'
But Steve Haywood, marketing manager for UK Live, the Berkshire firm behind Let's Rock Norwich!, wanted to reassure fans that bags and picnics are not banned.
'We just want to advise people that if they want to bring bags the queues may be longer due to security checks,' he said. 'We are not stopping people bringing bags, picnics and chairs but the extra security checks are expected these days.
MORE: Let's Rock Norwich! 2017: Retro festival will boost city's profile to host live music
'What you can not bring into the event is alcohol, glass bottles and sharp objects such as knifes if you are bringing a picnic.'
Mr Haywood added people can bring their own food and soft drinks but the bottles must not be larger than 500ml and must be sealed on entry.
The extra security checks come after the terrorist attack at an Ariana Grande concert in Manchester and Norfolk Constabulary have confirmed it will have a heightened presence at Earlham Park on Saturday to offer reassurance to the public and to support security measures.
It is the ninth year of the Let's Rock retro music tour, which started small in the Berkshire village of Cookham attracting 900 people.
Since then it has expanded and this year's tour started in Cookham on May 17. Norwich marks the midway point of the tour, which will reach 100,000 music fans.
The festival moves on to Exeter, Southampton and finishes at Clapham Common in London.
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