Some knowledge of general relativity on the level of an undergraduate course will be helpful, knowledge of the C prigramming language for some of the tutorials, Python and matplotlib to plot the new user tutorial. The exact format is still a bit in flux typically there will be a lecture or tutorial per day on the ET and a presentation on a result or project using the ET afterwards. Topics wise it will be similar to some degree to the 2020 ET workshop at LSU. You can find a link to it on the ET wiki main page http://docs.einsteintoolkit.org
Thanks for the information.