Keep your conference delegates coming back each year, and bring new people by making sure that you have lots of strong images of your delegates participating and contributing to your event.   The Fabian Society host a really vibrant annual conference each January and I have been photographing it now for 7 years.  Each year brings a great mixture of prominent opinion formers, MPs and activists, but the real secret to their success is the passionate involvement of the delegates who make the the event really special.