They are having a Halo tournament 3/31 in two shops in Nagoya: Nagoya Toys Paradise and Miraiyabuusu. The players will purchase first time limited dog tags (comes with rubber silencer (literal translation) along with a case and a logo on it). The dog tags are the tickets to the tournament.
So, if you’re going to be anywhere near Nagoya in the next couple of days, you might want to visit one of these shops!