The weblog Computer-Assisted Language Comparison in Practice, published on the Hypotheses platform for scientific blogging, offers tutorials and discussion notes on computer-assisted approaches to the history and diversity of languages. A substantial part of its content is contributed as part of the ERC Starting Grant “Computer-Assisted Language Comparison” (CALC, 715618), funded by the European Research Council. But on the long run, we want to make this blog a platform for everybody willing to share ideas on small or big problems involving data preparation and analysis in computer-assisted or computer-based approaches to language comparison. This document summarizes all contributions from 2020. If you want to cite them, please follow the instructions at the end of each contribution. I express my gratitude to all contributors, who helped to make this an interesting collection of tutorials, algorithms, and initial theories related to the fields of computer-assisted language comparison.