Sorry for the late reply -- the wiki does a bad job of informing me when forum posts are made. :(
How large would that list be? Seems to me like it would be giant if people contributed and it became anything resembling complete, and it'd also have lots of out-of-date info. I know our facebook page for just our local area spends some time out of date because one game store will stop having people show up, because those players moved to a new store and no one thought to update the page. That will be too difficult for us to manage here.
That said, if each state or province has one location (e.g. a facebook page) that manages its own list of meetups etc, then that's a more manageable list for us to maintain. We'd then have one link per state/province instead of tens or hundreds of thousands, and all fine-detail updates are made at the local level.