Some highlighted events I attended in the past years.
January 19th, 2012 – Theme Thursday: “From idea to app”, Baarn
The very first DutchAUG meetup about the Android internals was in the form of a mini conference with the theme “From idea to app”.
Sessions about concept and (interaction) design, best practices about developing and testing an app, and a session about how you can make the app visible on the market.
http://www.dutchaug.org/events/39918942/
March 16th, 2011 – Health Valley Event, Nijmegen
Health Valley is een platform van bedrijven, overheden, kennis- en gezondheidszorginstellingen met als doel kennis en kansen te koppelen op het snijvlak van gezondheid en technologie. Health Valley is ontstaan vanuit de provincies Gelderland en Overijssel, maar het werkgebied is groter. Samenwerking laat zich niet inperken door regionale begrenzingen, zeker niet op het gebied van gezondheid en technologie.
http://health-valley.nl/event/
Several NLJUG events (J-Fall / J-Spring)

NLJUG: Dutch Java Users Group consists of business partners, software developers, application architects, technical managers, students, and new media developers that have a common interest in all aspects of Java Technology.
February/March 2010 Adobe LiveCycle ES2 Winter CampĀ Spa, B
elgium
Adobe LiveCycle Enterprise Suite (ES2) is a SOA Java EE-based server software product from Adobe Systems Incorporated used to build applications that automate a broad range of business processes for enterprises and government agencies. It combines technologies for data capture, information assurance, document output, content services, and process management to deliver solutions such as account opening, services and benefits enrollment, correspondence management, request for proposal processes, and other manual based workflows. LiveCycle ES2 incorporates PDF (Portable Document Format) technology with Flex (Flash-based UI technology) to allow developers to create human interactive applications. Source: Wikipedia