I recently seen the video for "The Festival of the lost"and I remembered that I still have some of the items from last years event. So I went to my vault and see if anything changed. I saw my box of raisins that Eris Morn gave me and the description changed!! I actually saved this box of raisins for this reason(I like to save event items to see if anything cool might happen). I thought that maybe bungie would do something with them next event and so I didn't discard them. I guess my theory was right? But I don't know what the use of this item would be... Guess we just need to wait till the event starts and see if anything special will happen or not.