How to Prepare for an International Trip

Many of you in the know are aware that I'm headed overseas tomorrow to attend my friends' wedding.1  My students, however, are in ignorance of this fact. They're in blissfully unaware that when they show up for school next week, they'll be greeted by a dreaded substitute.2
With all of the work that must be invested ahead of time for a teacher to miss a week of classes in the middle of the school year (and it's a LOT), I've put off actually doing anything to get myself ready for the trip u...