Every runner competing in this year's marathon will be attending the Expo to register and collect their bibs ready for the race day on Sunday 26 April.
Runners and marathon fans will be encouraged to learn techniques and tips and try out products from sport suppliers.
This year, all visitors to the Expo can sign their name, write messages of support or contribute to artwork on a three-metre-wide YrWall, a digital graffiti product from Lumacoustics.
Images and messages from the wall will be used on race day at the start and finish line, to spur on runners and supporters.
All the artwork created on the digital graffiti wall will be uploaded to Facebook and can be emailed directly from the digital graffiti wall itself.
The event will feature a 'Virgin Zone' incorporating the 'Pasta Party', where runners can fuel their bodies ready for the race.
"By using the digital graffiti wall we are giving runners and fans a whole new way to interact with the marathon build-up and event itself. It really is an honour to support the London Marathon," said Lumacoustics commercial director Tim Williams.
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