Dear colleagues, We are pleased to announce that the next CCP4 Study Weekend in its 2020 edition will be devoted to the single most synergic task in structural biology: model building. Aside from covering the latest advances in both automated and manual procedures, the meeting will offer sessions on related topics such as refinement, validation and representation, with a focus on helping you produce the best possible model from your experimental data. All sessions will have an integrative character, presenting methods and approaches that may be indistinctly used with X-ray crystallography, and electron cryo-microscopy or diffraction. This meeting will have a couple of innovations too - more announcements will follow in due course. The most important ones will be posted here (as always), but for more fluid news, speaker profiles and direct communication with the organisers, please use hashtag #CCP4SW on Twitter or give us a follow (vide infra). As in recent editions, the event will be held at the East Midlands Conference Centre in Nottingham, from the 7th to the 9th of January 2020. We are very much looking forward to welcoming you in Nottingham. And yes, there will be a Cèilidh (https://en.wikipedia.org/wiki/Cèilidh). Registration and programme details: https://tinyurl.com/ccp4sw2020 Best wishes, Robbie Joosten (@Robbie_Joosten), Alan Roseman (@AlanRoseman3), Jon Agirre (@glycojones), and the rest of CCP4 (@ccp4_mx)