News of the three-day event, showcasing Lego fan builders and professional Lego artists, was announced last month and due to take place at the AEG-owned venue between 9 and 11 May.
Organisers revealed the event had to be moved to Excel, and will take place later on in the year on 27-30 November.
Clive Morton, director of Brick 2014, said: "We are very sorry to move the show from The O2, but the speed and quantity of tickets sold determined that we need more than 20,000 sqm of space, which is bigger than The O2’s exhibition space, and left Excel as the only sensible alternative to ensure we do not cause too much disruption to those visitors that have already purchased tickets."
"I would like to thank everyone at The O2 for helping us to launch this show and we will push ahead with plans to make sure Lego fans visit both venues."
Jeremy Rees, executive director of Excel London, added: "Excel offers the organisers of Brick 2014 the opportunity to expand and grow the show for many years to come."
A customer message published on The O2’s website read: "The huge demand for tickets and space required to accommodate the expected attendance has forced organisers to move the show to allow more visitors the chance to experience it.
"Because of the change of venue we have refunded your booking fee to you automatically, and you should see the refund on your statement in five to seven working days."
Brick Shows also announced it is planning more Lego fan displays and exclusive fan content as a result of the move, as well as every ticket being upgraded to a full-day pass.
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