It has been announced on the official website that there will be a Postacollect event in Tokyo on April 23-26. It will be held in JPTower Kitte basement floor 1 in Chiyoda-ku (JPタワー・KITTE地下1階 東京シティアイ（東京都千代田区丸の内2-7-2）) from 11am to 7pm (6pm on the 26th), and will feature a number of panels and events, including a Giant Mt. Fuji postcard you can take a picture with. I’m not sure exactly what each panel will be discussing (the theme is “travel and gotochi cards” which doesn’t tell me a lot) but the event sounds like fun! And it looks like participators will receive a mini-card for free as well!
I, unfortunately, wont be in Tokyo during that time, but I hope some fans can go and enjoy the event. Read the official post here.