"Minecraft" was released from beta in 2011 during a convention held in which city?

The statement mentioned that Minecraft was released from beta in 2011 during a convention. However, it did not specify which convention it was. As of my knowledge, there is no record or evidence to suggest that Minecraft was released from beta during a convention in Las Vegas. Therefore, the answer is incorrect, and it is unknown which city hosted the convention where Minecraft was officially released from beta.