After you have convinced an institution to donate data (or, if you are an institution: after you have been convinced) the real fun starts — how to upload all the data? Wikidata lacks a big friendly upload button, but that should not put you off. We'll look at various parts of a typical workflow: collecting data (copyright! data base right! fun!) cleaning data (repairing faulty data with Google Spreadsheets and/or OpenRefine) upload (QuickStatements, PyWikibot and everything else) about this event: https://c3voc.de