Hello. Devs and the Tech Team are aware of the issue with the Clifford Tree which affects some specific servers and they are working on it to find a solution and apply a fix for it. Until this happens, here is a workaround you can use and which will allow you to use and enter the event(icon will be accessible and content of Clifford tree will be displayed, for both Tree Upgrade and Tree Wish). In the link to access your server and the game, change the "http:..." to "https:...". Also, enable flash content, if you are prompted to do that, too ("Allow Adobe Flash to run" message, which might pop up on your screen).
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I hope this helps and that it works, at least until issue is fixed for good. Thank you and happy playing!