ChemCuration (#chemcur2020) is the second one day, online-only conference around data curation and curated data in the domain of chemistry, after ChemCuration 2019. Inspired by BioCuration and by other online conferences, this year will mark the first edition of a Twitter-based online poster conference. During the day, you will tweet your poster with the meeting hashtag and respond to questions about the poster in the 24 hours after your tweet. The poster must be available in an online repository (e.g. Zenodo or Figshare) under the CCZero, CC-BY or CC-BY-SA license.