To call insurance agent Tim Lippe, "naive" is a gross understatement. He's never left his small hometown. He's never stayed at a hotel. And he's never experienced anything like Cedar Rapids, Iowa. Sent to represent his company at the annual insurance convention, Tim is soon distracted by three convention veterans who will show him the ropes and push his boundaries. For a guy who plays everything by the book, this convention will be anything but conventional
Cedar Rapids (2011) - IMDb

I just saw Cedar Rapids today and LOVED it! I saw the trailer a while back and thought it looked really funny, but since so many trailers are misleading or show the only funny parts of the movie, I was still wary.

Ed Helms was hilarious, as was the rest of the cast. It was full of great character actors like John C. Reilly, Kurtwood Smith, Stephen Root, Mike O'Malley, as well as Anne Heche and Sigourney Weaver. We laughed through the whole thing. Definitely a thumbs up!