Use Text Editor built into Joomla for description.

I suggested to the creator that it would be great to be able to change the fonts, size, or even use HTML to personalize the look of your event description. Changing color, size, line spaces, adding paragraphs. You have an editor above, why not one in your selling software?

Being able to change font size would also be a good thing. I am older and my eyes simply can not see fonts below 12px without glasses. I'm sure you have many more people with the same vision issues.