I think we need to be clear that we need to see users of **GHRSST** SST, not just general SST users. We don't need talks by "users" who have invented their own SST product, unless they did so because they tried the GHRSST stuff and it was inadequate for them in some way -- in which case we need to see the evidence as to why it wasn't what they needed. That would be useful. A symposium with lots of "this is how we make our own specific product that only we use" is of limited use to us or them, yet previous attempts have had quite a lot of that sort of content.
How to achieve this? Well, we need effort to target genuine GHRSST users, perhaps. And clarity about this issue when promoting the event.