Organiser Upper Street Events is expecting more than 30,000 visitors, with advance ticket sales already reaching 12,000.
"We have already sold out a Super Theatre performance on the Saturday afternoon and are delighted that advanced ticket sales are at such a high level," said Gadget Show Live event director Matt Hodgins.
Around 120 exhibitors will be showcasing products in computing, photography, mobile communications, gaming and home entertainment.
Gadget Show Live is based on Five's technology programme.
