Double wedding?

Under the right circumstances, would you ever consider a double wedding?
My big sister and I are both engaged, on a similar timeline and share nearly identical visions of our dream wedding.  A duel ceremony would save so much money and lessen the burden on our enormous family (in terms of travel, etc).  Plus we love to share and our fiancés' are totally on board with the idea.  
Your thoughts dear Glow friends...

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