I get past that point. It's in the scheduling page where I need to enter a name, email and comment. The Book Event button was greyed out. When I just checked this morning it's now clickable. Initially I had set it to 21 sats, so if payments don't work it makes sense. I then changed it to 0 sat and it was still greyed out. Maybe it was just a delay in the relays updating the event to have no fee?