Eternity's Reach

The Eternity's Reach event is a great way to earn Charm Items, espceially if you are a free-to-play player. Here is a video link with a comprehensive guide on how to maximise your points which will lead to a higher level of reward.
Eternity's Reach Video Guide

Viking's Vengeance

The Viking Vengeance event takes place every two weeks on Tuesday's and Thursday's. Players must defend against twenty waves of AI-controlled Viking troops. Here is a video link detailing how you and your alliance can maximise your points.
Viking's Vengeance Video Guide

Kingdom of Power

The Kingdom of Power event is a major event where two kingdoms (servers) fight against each other through several phases. There is a Preparation Phase, a Battle Phase and a Triage Phase. Here is a video link explaining the process in full.
Kingdom of Power Video Guide

Governor Gear

Governor Gear and Charms can drastically increase your combat power if you know which items to upgrade first. Here is a video link furhter exploring this topic.
Governor Gear and Charms Video Guide