"Newcomer - 2015. Summer"

So, I didn't quite understand. Will I be able to participate in the tournament or not?

Yes, you will be able to.
The group stage will consist of four groups of 6 people each, totaling 24 participants.
Players who registered after May 31, 2014, and meet all the requirements for participants, will directly enter the group stage. The remaining slots will be filled by players who registered before May 31, 2014, with priority given to players with higher rankings. The rest will participate in the qualifying round - the winner enters the group stage, and the loser goes to the reserve list (i.e., as a substitute).
Since more than 24 people have applied to participate, it is necessary to hold a qualifying round.

Added 9 hours 37 minutes ago
Dear tournament participants. We have received reports that the introduction of a rule regarding playing on different templates is difficult for beginners.
A poll has been added for tournament participants. You have the right to choose the rules for the group stage yourself. The voting will last until the draw for the group stage. The results of the vote will be determined by a simple majority, provided that more than half of the registered participants take part in it.