I am a person who has to relocate a lot due to employment reasons. I tried to build English-playing groups with little or no success. In some cases, I was able to gather only one person or two. Only once I was able to gather four people (DM wasn't me), but the d&d 4th edition rules were too daunting to learn and focus. Things broke down after the first session (in addition, it required too much commuting).
Clearly, it depends on the city, and the country (d&d is not equally famous and played everywhere) but after you descend the airplane stairs into a new foreign country, what would your strategy be in order to find interested people and start a campaign?