Geriant,
After reading the article you provided I am not able to get things to work. I think I am doing this is the correct place. I am currently editing in the JEvents Custom Layouts->Event Detail Page.
My custom fields are set up and working. I've tried getting the example on the page to work using a field of mine called 'registrationInfo'. If there is information then I want the field to display. Here is what I have...
{{registrationInfo:registrationInfo#Registration info is %s#No Registration info}}
However nothing shows up, even when there is info.
My ultimate goal however is to get the 'registrationInfo' field to display only if a boolean field called "registration' is checked to 'Yes'. I am not seeing an example on how to do this, could you provide me with one? Or a link? I've been searching with no luck.
Final question, I assume the %s is for string, what if I am using an html field?