Dear colleagues: The program of the 2nd BCI-UC on February 10th & 11th 2021 from 03:00 pm to 08:00 pm (CET) is now online: https://bciunconference.univie.ac.at/2nd-bci-uc/ All presentations are streamed live and free-of-charge via https://www.crowdcast.io/e/2nd-brain-computer-interface-unconference/ The 2nd BCI-UC features keynotes by *Camille Jeunet* on "User-centered approach to improve BCI efficiency and usability: Stakes, Progress and Obstacles" and by *Marco Congedo* on "Recent Advances on Riemannian Transfer Learning". In addition, we have twelve contributed presentations on a broad range of topics and a symposium on commercial perspectives for BCI technologies. The BCI-UC committee: Moritz Grosse-Wentrup Anja Meunier Philipp Raggam Jiachen Xu