Techdays is one of the events that I usually go to every year. True, my background lies within the Microsoft technology but has broadened over the years. All with all, I still enjoy this event as it brings me up to speed in the Microsoft world in 2 condensed days. Looking forward to some talks, like the ones from Scott Hanselman, from who it is always pleasant to hear.
On top of that, it's in my home city, Antwerp, so that saves me a drive as well :)
More info at:
http://www.microsoft.com/belux/techdays/2011/