Experimenting with other game app.
Relic Hunting event:
A relic looks like the top picture but I tell you it will stress your eyes finding one because first off it is very small and secondly it is scattered very far far away from one another.
World Encounters:
This event refers to defeating non-players' camps. After defeating an encounter camp, your troops need to rest for a while before attacking another camp. So in the mean time, you could occupy youself by attacking other players or trading or something else.
Conflict:
Simply said to attack and resulting in wounding or killing troops of the opponent. You can attack encounter camps and of course other players.
Trading events:
Even trading can give you game advantage. Find trading posts and trade and score either for yourslf or your alliance. The trading post in blue circle indicates your own alliance trading post where you cannot trade but only collect tax and upgrade building level. So look for trading posts where you could trade small for higher amounts of goods.
Ancient Towers:
These towers appear on your alliance soil right when the event starts but they are controlled by other alliance. Attack them to take control and score.