Only ten teams are going to participate in the Clavision and that will happen next week. Only ten teams are going to participate in the Clavision and that will happen next week, the rest are just like tier 2 - 3 tournaments.
Nigma is one of the participating team. It seems that Nigma has quite huge fanbase in China because they always get invited to most of the tournament in China. I dont see Team Spirit on the list so they probably decline the offer to play there, expected though because they just won one of the best tournament for the whole season. Fissure Universe is probably the next on the list for top tier tournament