I liked all the events because when I was done with the Archon or Story quests, then events filled my thirst for more content. Also, the format of the events is decent as you get to do something after a period of time and don't feel bored after doing everything in a single go. So far, Midsummer Adventure island, Perilous Trails, Lantern Rite, and Invitation of Windblume were a few of my favorite ones. I mean, even If I'm taking a look at other events, I want to mention them because all of them have something special in them. I would say I'm emotionally attached to all of these events in some bits and pieces.