*EXTENDED* Call for Submissions - posters, demos, tutorials, workshops, panels ACM/IEEE Joint Conference on Digital Libraries (JCDL 2021) 27-30 September 2021 - online https://2021.jcdl.org/ Important Dates: (extended) 29 April 2021 - Poster and demo submissions (extended) 29 April 2021 - Tutorial, workshop and panel submissions 28 June 2021 - Doctoral consortium submissions The organizers of the ACM/IEEE Joint Conference on Digital Libraries 2021 invite you to make original submissions of posters, or demos on related research and practice. We also invite you to submit proposals for workshops, tutorials or panels; or submissions to the doctoral consortium. Details are provided on our website. All deadlines are at 11.59pm AoE (Anywhere on Earth). Regards, Dana McKay and Hussein Suleman JCDL 2021 program committee chairs