Participation depends on the individuals but I do not think I will attend this kind of conference. There are many publications, books and guidelines on Smart PLS and I even receive weekly emails on tips to using the software.
I think it can be beneficial if you want to become an expert on PLS related analysis. This time, Josepha Hair is the guest speaker I guess. Moreover, still, PLS has got grey areas that may be addressed within the conference and academic debates. I wish I could do, but I do not attend.