I eventually was able to create an event with "fantasy" in the title and description.
I tried again this afternoon, copy and pasting a title and discretion from a past event, only changing the event name and description to different combinations of "Fantasy". Again, I was notified my region could not support the event because it was not an adult region. So, I started with a minimal: "Fantasy event" as a title, and "4 - 6 PM SLT" in the description. That was accepted. Editing over and over, adding line by line, I was eventually able add everything I had originally pasted, including the rejected changes. I don't understand the filter. Maybe I overacted? Maybe I found a glitch in their filter? The odd thing is when I added a statement clarifying the sim standards, the word "g-rated" was also flagged, and I was was told I needed to be an adult region to host the event. When I removed the "-" and changed it to "G rated", it was accepted. I just don't understand rating restrictions as to how this algorithm works.