We have published a blog post with detailed recommendations on how to make use of the DataCite Metadata schema when mintig DOIs for academic events and series: How to mint a DOI for academic events and event series? - TIB-Blog
In the future every entry made in https://www.confident-conference.org will receive automatically and per default a DOI. For now we still have to rely on manually registering DOIs. If you are interested in receiving a DOI for any event, please contact us. If you want to register your own DOIs for an event, also contact us 
. We can then provide you with a ConfIDent landing page.
Thanks again to @Kelly and @Matt from DataCite for their valuable feedback during the writing process!