There's a high chance that if you have attended an event in a city in recent years, it was arranged through meetup.com. The site now has over 32 million members, over a quarter of a million meetup groups and over half a million meetups happening in 182 countries every month.
Aside from being a keen and regular user, meetup has always fascinated me, as it's a tech company with a core mission that is about getting people away from their technology and...