Few things can be as heated as determining the guest list. While we're not making promises that this will stave off hard conversations, it is a bit of fun in the admittedly difficult task of deciding who is ultimately getting an invite.
Want to avoid more drama? Instead of cutting down an initial list to get your guest count, you can also get into a room with all the list-makers (you, your fiance, the parents) and build your list. Since it's collaborative, there's often less tension.