Last year’s FSCONS was my first ever conference. One of the organizers for that event was a guest lecturer in one of my courses and while chatting with him after the lecture he told me about FOSDEM. If I had known about this event in bit advance I probably would have planned things out. So for this year I am probably not going to FOSDEM even though there are many interesting talks happening.

But I will be attending the first ever OpenNMS user’s conference (and the first major openNMS event in EU).  I have found at least one link which lists conferences relevant to software engineering. As for the OpenNMS conference I have already booked cheap flights on Ryan Air. I also have plans to take this chance to do some sightseeing in Germany (I will be booking YouthHostels or searching for places to crash along the Rhine river).

Two regional conferences which I can think of at this point(other than FSCONS 2009 in which I might be participating as an organizer) are opensourcedays  in Copenhagen and The 5th Internatinoal Conference on Opensource Systems in Skövde, Sweden.

Edit: (Feb 25 ,2009)
I may be attending the following conferences as well,
INTERACT 2009 12th IFIP TC13 Conference in Human-Computer Interaction
The 2009 IEEE / WIC / ACM International Conferences on Web Intelligence (WI’09) Intelligent Agent Technology (IAT’09)