It's behind you!published at 13:03 British Summer Time 17 September 2016
Is that a Giant Peach BBC reporter Chris Wood has spotted in the distance?
Summary
Popular children's author celebrated in his home town
Thousands lined the streets to see the Giant Peach, Fantastic Mr Fox, a Marvellous Medicine Machine and a lot more
A tightrope walk was delayed by crowd volumes, organisers said all necessary precautions were being taken to ensure crowd safety
It's behind you!published at 13:03 British Summer Time 17 September 2016
Where's George?published at 13:02 British Summer Time 17 September 2016
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End of twitter postAlong came a Little Miss Spiderpublished at 12:59 British Summer Time 17 September 2016
Seren, 9, dressed up as Little Miss Spider from James and the Giant Peach.
A busy day in Cardiff city centrepublished at 12:58 British Summer Time 17 September 2016
This rally in support of independence for Wales in the Hayes is not part of City of the Unexpected.
'Hold your breath, make a wish, count to three'published at 12:54 British Summer Time 17 September 2016
Claire Fleming from Cwmbran is dressed up as her favourite Roald Dahl character.
She said: "I grew up with him and am a huge fan. Willy Wonka has to be the best character.
"It's a little worrying I didn't have to buy anything for the costume though," she joked.
Fantastic Mr Fox fanpublished at 12:46 British Summer Time 17 September 2016
Kelley, 7, from Penarth is hoping to catch a glimpse of Fantastic Mr Fox.
Cardiff is readypublished at 12:41 British Summer Time 17 September 2016
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End of twitter postThe excitement builds...published at 12:40 British Summer Time 17 September 2016
A large crowd has already gathered ahead of the celebrations.
What's happening at the museum?published at 12:35 British Summer Time 17 September 2016
National Museum Cardiff is joining in...
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End of twitter post'A great day to introduce Roald Dahl'published at 12:34 British Summer Time 17 September 2016
Andrew and Jessica from Cardiff brought their children Freya and Heidi down to the city centre to introduce them to Roald Dahl.
"It's quite exciting," said Jessica.
It's a great day to introduce them to Roald Dahl."
Facts and figurespublished at 12:29 British Summer Time 17 September 2016
Today's City of the Unexpected event is a collaboration between the Wales Millennium Centre and National Theatre Wales.
6,000 performers are taking part, including 2,000 choristers, 1,000 dancers, 4 brass bands... and 40 bald men!
Nigel Jamieson, the man in charge, has directed many large-scale spectacles, including the Sydney Olympics opening ceremony.
He says although the budget for City of the Unexpected is lower than for some of those events, "in terms of scale, of time, and energy, and ideas, it's one the biggest things I've been involved in".
Image caption, Nigel Jamieson: "No city has ever attempted anything like this"
Books growing on trees?published at 12:28 British Summer Time 17 September 2016
A Roald Dahl book tree has shot up on St Mary Street in Cardiff city centre.
Travel advicepublished at 12:23 British Summer Time 17 September 2016
Several roads in Cardiff city centre are closing at various times during the weekend to accommodate City of the Unexpected activities.
Mainline trains between Cardiff Central and Newport stations aren't running as part of the electrification programme, but there will be a replacement bus service and Valley line services will run as normal.
Cardiff Council have published detailed travel advice, external on their website.
Image source, City of the UnexpectedA city transformedpublished at 12:12 British Summer Time 17 September 2016
Reality is being turned on its head in Cardiff today "as if Roald Dahl is at the helm" for the City of the Unexpected celebration of the author's centenary. BBC Wales reporter Geraint Thomas had a look behind the scenes during the preparations.
