Despite the COVID-19 pandemic, the EUROCALL society succeeded in holding the 28th EUROCALL conference, EUROCALL2020, on 20-21 August as an online, two-day gathering. The transition process required to make this happen was demanding and insightful for everyone involved, and, in many ways, a logical consequence of the core content and purpose of EUROCALL. Who would be better suited to transform an onsite conference into an online event than EUROCALL? CALL for widening participation was this year's theme. We welcomed contributions from both theoretical and practical perspectives in relation to the many forms and contexts of CALL. We particularly welcomed longitudinal studies or studies that revisited earlier studies. The academic committee accepted 300 abstracts for paper presentations, symposia, workshops, and posters under this theme; 57 short papers are published in this volume. We hope you will enjoy reading this volume, the first one to reflect a one hundred percent online EUROCALL conference/Online Gathering. [This content is provided in the format of an e-book. Individual papers are indexed in ERIC.]