I am happy to attend GUADEC 2013 this year.
The open source / freeware world is small and sweet. :-)
I didn't know and meet Andrea Veri before GUADEC(but always see his name on mail list).
The first time I saw his name cause nagios with jabber in 2012 (http://www.dragonsreach.it/2012/02/18/nagios-xmpp-notifications-for-gtalk/), cause I am interest in nagios for monitor servers and PC.
We did lots of workshop with nagios and openSUSE in Taiwan, and I wrote an article for workshop (http://sakananote2english.blogspot.tw/2012/04/nagios-with-opensuse-121.html) for everyone in English.
It's very nice to meet the real person in real world.
And think Andrea Veri help me a lot in GUADEC.
It's great to attend GUADEC