I contacted on their site with no response and via email at the address they provide (I I did a copy and paste) and received a response from the postmaster saying the Domain Name System (support @ Ceramic School) does not exist. It recommended calling the person for their email. I am angry at this point and thinking it is a scam.

Angry, too. I have contacted other colleagues in Sweden who have the same problem. So, it’s not just you and me. I have emailed “Joshua”, no answer as of yet. 

Same thing here: no response whatsoever after my email. Bought my ticket in April. Very strange… there is no way to find out where the congress is streamed and how to enter.