KDE will have a presence at the upcoming Linuxtage event in Graz, Austria (April 25+26).
Harald Sitter will be giving a talk on KDE Plasma and we will have an info booth through out Saturday 
See the rest of the program (talks in English and German) here
Additionally we have worked with the even organizers to co-locate a KDE Plasma Sprint at the same university campus (but for the whole week) and we should have enough space in our KDE Dev rooms for other KDE contributors who would like to join 