Maybe nice for Drupalista's to: Mobile Café. The next one will be about the iBeacon, Behavior design and Distimo App Analytics. Admission is free and it's at the familiar location! Register via meetup.
The Drupal User Group Netherlands is a monthly meetup or so called "drupalcafe" in Utrecht the Netherlands. The cafe is aiming at sharing knowledge and tricks of the trade of Drupal, share a techtalk or do a codesprint whilst enjoying a drink!