King of Avalon almost always has one or two seasonal events being active. At this time the Friendship Event is one of them. This guide explains how the event works.
You have a chance at getting Bracelets when attacking monsters or rallying barbarians. These Bracelets can be used in your items to turn into rewards.
You need to rally barbarians or slay monsters to have a chance of getting a Bracelets. You also get these Bracelets when killing monsters eventhough the description only mentions rallying barbarians.
So far I only hit higher level (29-30) monsters during this event and each time I got 4 Bracelets.
So far I have received the following prizes from Using the Bracelets: Gold, 1k Food/Wood, 24 Hour Farm Boost.
I haven't used many bracelets yet, but so far I am not impressed with the prizes based on comparison with previous seasonal events.
The event is similar as previous ones, but the prizes seems less impressive.