Rugby Expo - which launched in 2008 - is holding this year's November event at RHS Lawrence Hall, in Westminster.
The expo - which combines a conference and exhibition - has previously been held at Earls Court and Queen Elizabth ii conference centre.
Rugby Expo 2010 is one of a series of exhibitions to boost business for the RHS Royal Horticultural Halls (RHH) this year.
The event's project director Jonathan Wilson said: "Everything from the size and class of the Halls and its facilities to the central London location, matched our needs."
Energy from Biomass and Waste and Adventure Travel Live both launched at the centre this year and have confirmed their return in 2011.
RHH head of commercial operations Maugie Lyons said: "We have always prided ourselves on being one of the best venues in London for launching niche exhibitions and are delighted that these shows are returning for another year. Both events had excellent feedback from exhibitors and visitors alike and we are confident that they will repeat their success next year."