All Dark Events are viewable month by month. So you will be able to see for yourself. Even if it is permanent, it doesn't force you to fight the 1st pod. Shinobi's can usually discover a path through/past alot of pods

Yeah, i can see the DE is there, my question is: does it go away?
Maybe a shinoby can pass by, but never a whole squad!

You dont need a whole squad for about 80% of all missions ... but ok, thats another story.
And to answer your question;
It wont go away. Dont know who did tell you that only "tactical" DE are permanent (wonder why you think this one is not tactical) ... its for sure not true or tactical means all that belong to better Advent/Alien in a way.
If a DE is not permanent it normally says that it is not, when you discover it. And as alreafy told elsewhere, that are not many ... and always of that kind like the UFO Hunt ... it is in nature of that DE`s that they are not permanent. All others are as far as I know ... but you nearly can counter any of them with good intel from beginning.

I am in december now, prett, far in the game (second avatar-facility-assault), and in the beginning i did many missions solo or with only 2 or 3 dudes. It was much fun (good old days).

But now the aliens are more numerous and strong, and they got this damn vigilance, so i prefer to go in "hard".
I have suffered bad times now more often.

Maybe it's the wrong approach, do you still play stealthy mid-game (with dark event vigilance)?

I am in January 2036 now, have liberated about half of regions, have contacted all, did start the gate Mission now ... and still do many of my missions with one or two shinobis or a shinobi and a specialist ... I have much more pods now inside a mission, much better enemies and the pods are bigger ... but 2 of my shinobis can normally kill a complete pod within a turn if things go wrong ... but they do not often ... cause also stealth works better late game and the possibility to restealth, going through walls and use hooks can solve nearly all problems you can get, if they detect you once.

P.S: I dont have vigilance running ... I did counter it. So perhaps its much harder for you ...

Thank you!
How do they kill a whole pod?
With awc-pistol-perks?

I ignored the pistol for soo long =(

With pistol perks, yes, they get very powerful and also with that Master Sergeant abillity that gives you a bonus action for serial kills (dont know the english names, but translated it means Serial kill for shotgun and Reaper? for sword)
Longest Serie I had till now was 11 kills in a row, but some ppl even did 20+ ... dont know how they manage this, cause every attack does less damage ... but it seems possible.

Ok, i am stl waiting for my first master sergeant (because i do not many solo - missions i gain xp very slow).
However, yesterday the dark event disapeared, funny. Anyone knows if there are missions releated to DE, witch make them, if completed, go away? I saw no hint in the mission briefing or similar.

And.i did my first 2 man-mission since months, how in the olf days. So sweet...