Dear Helena, thank you for your feedback. This powwow is indeed Translation Forum Russia. But it is not a dedicated event for ProZ.com members, this is why it's not on the ProZ conference page.
Helena Diaz del Real wrote:
just by chance I read the information about this powwow and realize there must be a conference in St. Petersburg.
Where can I read more about the conference? And why don't you make it known at the conference page of proz.com? I am sure, there will be more people joining you and of course, many more interested in attending it! (Me for instance!). Please consider this proposal!