Translated from official Japanese Konami site by me:
Notice of Event Cancellation
We are deeply grateful for all the special attention and fan-base that our company have been receiving.
Due to various reasons, the "METAL GEAR SOLID 4 GUNS OF THE PATRIOTS" launch memorial event which was to be held on June 12 at 3 different locations within the Tokyo area, has been canceled.
We apologize to the customers who were looking forward to this event, and also ask for your understanding.
-June 10, Konami Digital Entertainment Corp."
Editor's Note: Story URL links to a bad translation from google translate. Credit URL links to the original Konami notification.