The leisure-and-entertainment-focused company said in an update that a variety of television and film actors have been engaged for the convention, including Benedict Cumberbatch and Chiwetel Ejiofor.
Challenger also said that the Star Sanctum website has been altered with additional functionalities to facilitate more personalised purchasing options for customers, including private meetings with actors and concierge services.
The convention will be held from May 5 to 7 at the Mermaid Centre in London.
Mark Gustafson, Challenger's chief executive said: "Fan convention events have proven to be incredibly popular in the US thanks to the unique opportunity they provide attendees with to meet the stars of their favourite film or television show."
He added: "We are delighted to be supporting this event, which could be the first of many exciting opportunities to come."