Dear Colleagues, The *abstract submission* for the 3rd Brain-Computer Interface Un-Conference (BCI-UC) *closes on Friday, December 3rd*, *at 11:59 pm (CET)* and the *voting period on submitted abstracts begins on Monday, December 6th* [1]. Abstract submissions are text-only. The length and format of the submissions are up to the authors - use whatever format you consider best for attracting up-votes! Important dates: - *Submission deadline: *December 3rd, 2021 at 11:59 pm (CET) - *Voting period:* December 6th, 2021 - December 12th, 2021 at 11:59 pm (CET) - *BCI-UC event:* January 27th, 2022, from 03:00 pm to 09:00 pm (CET) We will invite the *authors of the top-voted abstracts to present* at the un-conference. The 3rd BCI-UC will feature *keynotes* by *Cynthia Chestek* (University of Michigan) [2] and *Thorsten Zander* (TU Brandenburg) [3]. BCI-UC is an online un-conference that provides rapid dissemination of novel research results in the BCI community. Participants can *submit abstracts* to apply for *20 minutes presentation* slots. Abstracts are not reviewed by a program committee. Rather, all registered participants can vote on which of the submitted abstracts they would like to see presented at the un-conference. Because the BCI-UC does not publish conference proceedings, submitted abstracts can report novel as well as already published work. *Registration and attendance are free of charge*. Presentations of the 1st and 2nd BCI-UC can be re-watched at [4] and [5]. *All presentations will be streamed via Crowdcast* [6] and can be accessed free of charge. Join us in supporting this novel community-driven dissemination of research results! The BCI-UC committee: Moritz Grosse-Wentrup Anja Meunier Philipp Raggam Jiachen Xu Links: [1] https://bciunconference.univie.ac.at/3rd-bci-uc/ [2] https://scholar.google.com/citations?user=36sxAZEAAAAJ&hl=de [3] https://scholar.google.com/citations?hl=en&user=0E49HxYAAAAJ [4] https://bciunconference.univie.ac.at/past-events/1st-bci-uc/ [5] https://bciunconference.univie.ac.at/past-events/2nd-bci-uc/ [6] https://www.crowdcast.io/ -- DI Philipp Raggam, BSc Research Group Neuroinformatics Faculty of Computer Science University of Vienna Hörlgasse 6, A-1090 Wien, Austria