Diplomacy
As the event consists of two teams: Reds and Blues. Your clan has to choose a side they'll be playing at during the event. Moving to another team while playing isn't allowed, so better choose carefully a team before the event starts, as you'll not be able to change anything afterwards.
How does diplomacy work
All clans are free of their choice, they decide what clan they're going to play with or against, clan leaders / co-leaders (or management, incase if leader is away) take a responsibility for choosing a team, so if a leader has choosen a team for their clan, the members of this clan will be playing for this team.
Clanless Players
Clanless players apply on their will too, they can do it in the specific topic.