This is the 6th time I was informed that I had joined the public event and when it was over, I could not collect the reward because it said that it requires event participation. What a CROCK!!!!!!!!!!!!!!!!!!!!!
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This happens to me on that public event all the time. Several times I've started that event ALONE and finished the event ALONE and could not open the chest with the same message. I simply avoid that event now. :-( Happens on the tangled shore where the scourge is fighting Spider's helpers. You kill all the scourge and mini boss and can't open the chest. I avoid that one as well now. :-(