Registration for the workshop is necessary and all participants are encouraged to register as early as possible (via the online registration form) to provide the scientific advisory committee and the local organizers information for organizing the workshop sessions. The workshop format is such that there will be focus sessions on particular topics (e.g., the nuclear EOS, neutrino opacities, radiation transport etc.) that will include 1-2 longer overview/introduction talks, a number of shorter contributions and ample time for discussion. We are not collecting abstracts with the registration, but will solicit abstracts once the scientific advisors and the local organizers have reviewed the list of participants and their interests. The latter we ask you to express in the provided text field of the registration form.