I quite enjoyed the new April Fool's event that Cryptic added last year and was happy to see it return, but as my focus is currently on other MMOs I didn't really plan to grind the dailies again, plus at first glance it didn't look like anything had changed about the event. That was until I learned that this year, they also added an event dungeon called Sewers Most Fowl, in which you get to play as chickens in a group PvE context.
I did it with my guildies and it was great fun. If you enjoy this kind of thing, I can only recommend going in blind with friends and allowing yourself to be surprised - the event is on for another three days or so. Otherwise you can just watch me and my guildies bumble through it in this video: