it is an academic conference where people pay to attend…usually when there is a call for papers people submit proposals for talks/demonstrations and these are reviewed and a small number selected for presentation.
however, if there is space, non-academics can pay to attend and if they are students they get a reduced rate.
hope that helps
if you are interested in attending, even for one day, I would email them and ask is there space and what is the rate.
Aphra.