How to create conditional checkboxes that hide each other? I have 2 check-boxes.


Checkbox 1: Attend event for 1 day
Checkbox 2: Attend event for 2 days


If a checkbox is selected, I want to hide the other one. I don't want the user to be able to select both. If I create 2 rules, I get a circular reference error which breaks the form. 

How do I achieve what I described?
Simple solution: Don't use 2 fields with checkboxes, use one field with radio buttons.