Should be allowed questions like "Where AnimExpo will be?" or "How many people went to Comiket 83?" be allowed? Some could be intereting, while lots others will not as being too localized, so should there be a policy regarding this?
I'd hate to parrot myself about being a news outlet so fresh into a site, hahaha. But I would basically think that at this point, the question feels less about the subject matter and more about, well, us, the people and consumers of it. I'd consider it not really applicable for the main site Q&A before we even reach that point.
That said, organizing community meetups at these kind of events is not something foreign for using the meta site, or the chat service. Although, with the sheer number of conventions that are around for these kind of things, it might be a bit better to have a dedicated chat channel for local meetups, and reserve giant meetup threads for them real big ones.