On Thursday, 20 January, from 2pm – 5:30pm CET, representatives from NCC Montenegro took part in the Training Best Practice Seminar organized by CASTIEL project. The topics for the seminar were: How to organize an event such as an HPC hackathon or a winter-school and how to attract (new) attendees. Dr. Tomo Popovic and Dr. Luka Filipovic gave a presentation on How to organise an international conference, and discussed the experiences on organizing a HPC/HPDA/AI workshop within IEEE Information Technology IT2021 conference that was held last year.