I personally am a big fan of the very concept of Dark Events, and there really wasn't enough of them for me. So - more incoming! You can also customize the mod by editing the ini file, which you can find here: %STEAM_FOLDER%/steamapps/workshop/content/268500/652169373/Config/XComDarkEvents.ini . Feel free to turn on or off events that you like or dislike. By default all of them are on. 

I tried to make them tweak your game experience in more subtle ways, just like the original Dark Events do. They also shouldn't be too imbalanced, I played a campaign with them on ironman legend for few months and didn't have too much trouble. 

NOTE: Unfortunately, you'll need to start a new game in order for this mod to take effect. 
This mod doesn't override any classes and should be compatible with any other mod (unless they override something important :) ). 

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List of the Dark Events: 

Advanced Firewall. Hackers suffer +20 penalty to their tech score, and all other operatives - +3. 

Integrated Communications. All ADVENT soldiers receive a Squadsight perk. Sometimes though, they'd still prefer to get closer to increase their aim roll. Be advised: there is also a permanent version of this event. 

Sabotage Protocol: Scanning times for Avenger are slowed down twice as much. 

Security Exploit: Slows down current research by 30%. 

Arms Enhancements: ADVENT troopers will receive random advanced weapon upgrades on the tactical field. The list consists of: scope, laser sight, hair trigger, expanded magazine and auto-loader. There is no stock or repeater, that would be too cruel. They also don't drop it after their death. 

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If you encounter any bugs(features), errors, Easter eggs or any other weird stuff - let me know. 
And if you have any suggestions as for improving the mod - I'd be glad to hear them. 

Enjoy! I hope you like it.