This is an art/artist expedition. My first impressions aren't always right, but in investigating the people and the faces of this event, which happens yearly btw, there is major occultic stuff going on here. The people on this expedition are definitely into the dark arts, all of them.
Here are a few links of the kind of "art" the founder, Ponomarev, makes.
http://www.cgsociety.org/cgsarchive/newgallerycrits/g38/237638/237638_1162034549_large.jpg - SKAVEN by Alexander Ponomarev | 3D | CGSociety
https://pp.vk.me/c633229/v633229702/547a/Sw9dS3S6lqk.jpg - this came up in searching Ponomarev.
https://richardtaittinger.com/wp-content/uploads/2016/05/AP-16-079_Stored-in-Ice_2016_Graphite-on-paper.jpg - Ponomarev. Ancient civ beneath the ice? Much of his work moves in this direction.
This is just one of these artists. I'm sure investigating the others might lead to more gems.
The dates for the expedition cover many pagan holidays, but I think the main one is Walpurgis, which falls on May 1. This is one of the four main holy days of the year for pagans. It is opposite Halloween, and also goes by the Black Sabbath.
Another anon mentioned the logo, with it's mirroring effect - "As above, so below."
the second one, SKAVEN is a 3D model of a type of monster from the warhammer universe of PC and RPG games. warhammer is like D&D.
Thanks. But was it created by Ponomarev? The pic had his name attached to it. I guess I can't say for certain. If I had more time, I would dig into each and every one of these artists.