A skeptics meeting like that is excellent for anybody to attend to learn and understand the merits of objective critical thinking and investigation!
If everyone went to that regional convention before going to the JW regional convention afterward, I would suspect that there would end up being hardly anyone attending the JW convention after attending the skeptics convention.
Although skeptical, critical reasoning events are certainly very good in a general sense, I think that people affected by a specific exposure to non-critical thinking outfits such as the JWs should still seek out and attend meeting groups specifically tailored and relevant to that particular shared experience; i.e., meet-ups and “apostafests” with former or questioning JWs. Us folks with that very specific background need all the camaraderie and support we can find!