Starting in 1996, Alexa Internet has been donating their crawl data to the Internet Archive. Flowing in every day, these data are added to the Wayback Machine after an embargo period.
The Wayback Machine - http://web.archive.org/web/20040214020046/http://icp.meetup.com:80/faq/single.jsp?faq=is_this_free
Is this free?
Yes, Meetup is a free service. Some venues pay Meetup to be listed and to help coordinate events. (Note: We NEVER force a Meetup to be at a particular venue. Meetups only happen at places that the people vote for.)