SoundCloud created a page on their site devoted getting people involved with their Meetups.
It did an elegant job of giving people a 1-2-3 for jumping on board, and encouraged the common tag. They also suggested that SoundClouders get SoundCloud groups going for attendees. Swoon!
This is truly a beautiful screen capture. Evernote not only made a fantastic blog post and embedded the map on the right side of their side, they included the adorable M logo amongst their social links.
Foursquare really emphasized the self-org nature of Meetups Everywhere — the perfect way to scale your efforts, and that of your fans!
Shakira linked to her Meetup Everywhere page to bring fans together to do the Waka Waka dance for a good cause, at Meetups all over the world!

Leading up to the first day of your Meetups, blog, email, tweet and Facebook post about the progress. Share fun stats about the people and cities getting involved. Brag about milestones — “We’re now in ___ cities!” Simple posts can do a lot!
Just be sure celebrate the whole range of activity, from the lone person getting things going in their own city, to those Meetups with a bunch of folks who already have their details ironed out. It all contributes to the growth of your community!
The A VC Meetups Everywhere map is the only widget on Fred Wilson’s blog.

TechCrunch wrote a blog post, embedded their Meetups Everywhere map in a prominent, static place on their site and — bam! — readers self-organized all over the world.

TechCrunch’s excitement over this chance for their readers to Meetup was evident in their blog posts about it. This is the second post they made, and it cited cities all over the world that were set to participate in the global birthday celebration.