I don't know if it has a damn thing to do with Death Note, but I had the heads up from Viz Media - the North American distributors for Death Note manga - so you never know.
We're taking about Halloween ComicFest 2015, held on October 31st (obviously), purportedly worldwide.
From what I've seen - granted, in a most cursory look - there's an emphasis on North American stores. But I did chuck in my own local, non-American area into the store locator and came up trumps with two options from which to choose. (Or visit both, if free comic greed overtakes my need to limit travel costs. As it probably will. I've been known to cross many, many miles in pursuit of a good story.)
The country list, while not exhaustive, does indeed appear quite extensive.
Death Note Cosplayers, Get Yourself to ComicFest 2015!
Or putting a Death Note cosplay together brand new with just two days to go - nothing like leaving it to the last minute, but at least it puts you ahead of the game in terms of the year's usual array of comic conferences and conventions.
If any of you do participate in this way, please do share your pics with us, so we all get to enjoy the greatness. We might even feature them in a Death Note News gallery!
Here's Spiderman to tell you how to enter your Death Note costume in the contest:
Then take a photograph of yourself in costume holding said comic - it must be clearly visible, presumably for potential use in future marketing materials - before heading on-line to fill in the form and submit the picture.
Finally, beg, bribe, blackmail or otherwise persuade all of your friends, family and fans to vote for your entry into the competition. Sit back and await riches, fame and fortune resting on the laurels of your fabulous Death Note cosplay. (Or any other costume obviously, it's just that this is a Death Note website, hence we're duty bound to push you in that direction.)
Oh! And send a link for your picture to us, or send a copy via our contact channels for extra international acclaim. Good luck!