Hi Paul,
To clarify, are you referring to adding margin to these paragraphs?: https://share.getcloudapp.com/nOuXY6X8
These paragraphs don’t have a conventional p tag. They have common classes though, however I’m not sure if these classes vary for every single events page.
The code you currently have is adding margin to the entry content.
You can try if this CSS would work for other single events pages:
.single-event div.cxmmr5t8 {
margin-bottom: 20px;
}
You may add this in Appearance > Customize > Additional CSS.
Kindly let us know how it goes.