Ah Ha!!
Now that I have added that CSS, I don’t need the code in the functions.php file, because I can now see the text that I added under Events>>Settings>>Display>>Advanced Template Settings
Actually, it looks like my mistake was a good thing.
It appears that the free Calendar Plug-in does what I need, and I need to sell tickets, so at this stage we’ll work through it and see where we end up.
I’ll leave this Ticket open for a while if that is OK.