To be in with a chance of attending, potential guests have been asked to answer the question: "What would be in your party box?" via Twitter. Winners will be awarded a place for themselves and two colleagues at the unique event.
Taking place on 16 July, many details of the event will be kept secret, with Theme Traders hinting that entrants must be free to attend a location within London's Zone Two from 5.30pm.
The company promises the winners a theatrically immersive experience.
When launched to the market, the bespoke Party In a Box concept will be able to hire for corporate parties, consumer-led activations, product launches or as a party-within-a-party style experiential installation.
In April, Theme Traders hosted a nostalgic and surprising secret party for the industry at its warehouse in north London.
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