Please join us  December 18th and December 19th as we host the VII Cosmological Olentzero Workshop at the University of the Basque Country (UPV/EHU). This year, our Christmas workshop will feature discussions led by experts in the fields of theoretical cosmology and topological defects. In addition, we will also celebrate the career of our very own Prof. Ana Achucarro who has played an important role in the development of these topics over the last few decades. We look forward to your participation in this exciting workshop.