Hi Tony,
We don’t have that list up because in a sense, we might be associating ourselves with companies that could, in theory, make some people unhappy with their service, or be unavailable, or change the way they service clients over time… so it’s a hard type of list to keep updated.
You know what I would suggest though? If you go through the showcase thread and see a calendar you like, you can contact the site owner and ask who did it for them, or if they did it, and perhaps they can help you. Here is the link: https://theeventscalendar.com/support/forums/topic/showcase-2-0/
However I think that the Events Calendar is simple enough, and has enough documentation, that anyone who is familiar with WordPress and coding should be able to help you out with it.
Hope this helps!
Joyce