http://www.vipnation.com/faqs/Q. What if I can’t go? Can I give my package to my friend to use?
A. Packages purchased through this site are non-transferable. Only the person listed as Attendee on the Order Page may use the packages. The reselling of packages is strictly prohibited and resold tickets will not be honored at the performance venue.Eric....IMO if 3 out of 4 are the original named attendee's then a new number 4 should be permitted. It is not like you have sold the whole package as you will be there yourself. Why not email the address listed under the faqs to clarify. (if it has been purchased through vip nation of course)
You can email us at info@vipnation.com or call us at +1-888 458 8297, toll-free from the U.SConsidering many of these packages were purchased months ago they should understand situations change.
If that fails, remind them Al says 'This time its all about the fans' and to loosen up!