We are completing the 4th year of the Alexa Prize Socialbot Grand Challenge that aims to advance human-computer interaction through conversations. 9 university teams participated in this year’s challenge to create socialbots that can converse coherently and engagingly with humans on a range of current events and popular topics such as entertainment, sports, politics, technology, and fashion. The supported teams include returning ones: Stanford University with Chirpy Cardinal, University of California, Santa Cruz with Athena, Czech Technical University with Alquist, Emory University with Emora, and Moscow Institute of Physics and Technology with Dream; as well as new participants: University of Texas at Dallas with Caspr, The University at Buffalo with Proto, Universidad Politécnica de Madrid with Genuine2 , and University of Southern California with Viola.