Personally and as a company we support the community in multiple ways. These have included sponsoring numerous Camps and Cons including London and Szeged.
I've been on the London Drupal Camp organisation committee since the very beginning and have helped build that to one of the largest European Drupal events each year (http://2013.drupalcamplondon.co.uk/) (http://2014.drupalcamplondon.co.uk/)
We also run the Drupal Beer and Chat once a month (http://www.meetup.com/London-Drupal-Pub-Meet/) in London. In addition, we do the Drupal Show and Tell (http://www.meetup.com/London-Drupal-Pub-Meet/).
And there's much more you can see on our Drupal Give page http://www.cameronandwilding.com/drupalgive