Guild Wars 2

I write here because I do not know where to write, the server Blacktide top event for armor for karma, I can not understand it works or not?
that day I can buy armor for karma

That’s a bug. Seems to be on every server. “Drakkar Lake [DE]” is the same.

Maybe I do not understand something, can this point can be opened?

Ups, got you wrong, sorry. That is only opened when the 3 Melandru events have successfully been finished. Only then the karma merchant appears there (from what I know).

You will find more information about the events here in the events section.