For the first class of this lesson, I made a quick PowerPoint using all of the flags that are on the mat of our activity room. My classroom has six tables, which we used as teams, and each team was assigned a continent using a die that I had made. That team was then responsible for learning only their countries' flags, so when we went to the activity room they would know where to say they were from.
In the activity room, we played it in the style of "1박2일", where one student from each continent would have to stand up. The goal was to say, "I'm from ...." and sit down as quickly as possible before another person would say it. If two or more players speak at the same time, they're out... The last person to answer is out if there's no FAIL... and if the player makes a mistake, they're out. It's a fun, quick intro game.
Here's the PowerPoint: