The one day show, taking place on Thursday 26 April at Leeds United Football Club, will feature more than 100 hotels, venues and industry suppliers exhibiting.
Chef James Martin will guest speak at the event, with appearances from industry figures including James Berresford, chief executive of Visit England.
Allen will present "Because you’re Worth It", which looks at how to add value to your events.
Show organiser, Emma Cartmell of Event Management 360, said: "Attracting such high level industry speakers such as James and Samme shows how well regarded the Conference and Hospitality Show has become. We are now the only show of its type outside of London and are proud to be flying the flag for Leeds and Yorkshire".