JoenenFor Yu-Gi-Oh! Day in Japan, you have a 1/4 chance of winning a special deckbox in a lottery. Don't worry. Even if you don't win, each participant will get some stickers! Yay...
For the High Speed Riders set, you can participate in a Speedroid showcase event. You'll duel the staff at the event, with both players using the Speedroid deck. Each participant gets a (paper!) mat themed after DP Battle City or SD Master of Pendulum. You'll also have 3 chances to get a Tournament pack.
Best for last, for your (paid) entry iinto the Asian Convention, you get this Cyber Dragon Xyz Playmat!
Source 1 Source 2 Source 3