[support] Setting up a content check rule

[Roger]

I had an instance just this weekend where a contributor made an entry in 
an event system and forgot to enter some data.
I find I need to validate data in an event entry form and check if 
fields are not empty. I do not need to check at this point if data is 
correct.

Can someone on list guide me on how to set up the <Rules> <Conditions> 
to check each field, particularly the date field.

Alternatively is there another way to check/validate fields and advise 
the contributor.

Can someone point me in the right direction please
thanks
Roger