The letter thing is a little bit silly, so it definitely fits us.
It's not just Elena staying away. This is a two-way street. You can play nice for one night, for Caroline's sake, too. Your social circle is too intertwined with hers to keep them separate without hurting the places where you overlap, like Caroline. She's made choices that you disagree with, you've made choices she's disagreed with- let's all let the past be the past for one evening.
I know my dysfunctional sibling relationship, but that's about it. Well, that and Klaus's Victim/Hero complex, but that's a different subject entirely.
I say we get them a night at a hotel, complete with an enormous vat of lubricant. ... I might be feeling a little silly right now, which is probably the motivation behind that.