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J.D. DooleyJ.D. Dooley 

visualforce page that displays lead object fields that are missing so user can input required values

I have several validation rules on the lead object. The VR is applied once lead field CPS S= Showed.  
CPS S field is updated automatically when an Event, Event Type= CPS, has its Event Status changed to Showed.

Currently the validation rule prevents a user from saving the event as showed, until they updated the required fields on the lead object. 

My goal.  When a user changes the event status to showed a visualforce page with the lead object's requried fields is displayed and the user can enter the required fields and then save.