When you invite people they can accept by clicking 
without even looking at the page.
That being said single elimination did turn out to be bad. I don’t know what settings should be proper. Yet. In my head I didn’t want to give people multiple games to play at the same time so round robin and simul was out. As far as I understand, swiss and normal mcmahon are borked at the moment. So I ended up with elimination but it also turn out to be bad.
I hope there will be the second time and it will be better!