Meetup is one of the most engaging event and group sites online.  Join or start a group and you can start searching for live events in your area or around the world.  Organizers can host their own events and meetups and build a community in the industry or hobby you love. 

The site has all groups for just about anything.  It's included here because there are great groups and events for every aspect of real estate in just about all parts of the country.