Just the begining of the list, which is rather long, thanks to Carlos:
Iniciador: http://www.iniciador.com/
Twittmad: http://www.twittmad.com/
Conversion Thursday: http://www.conversion-thursday.com/
Beers & Blogs: http://www.beersandblogs.es/
Thursday: http://www.mayorgas.com/2009/02/19/emprender-en-internet-93%C2%AA-edicion-de-thursday/
First Tuesday: http://www.firsttuesday.es/
Meetup Metaverse: http://gamedev.meetup.com/184/
Likemind: http://www.google.com/calendar/event?eid=NzIzcW85dWQ5YmZuZWt0cmhuMjUwdGpnNDggZHNoNWI3Zzk2Y2wxYmhyMzNkcXVmM2RiMW9AZw