I think you really have to make an effort, right at the time when you are usually just concentrating on getting settled and getting basic things organized. At the beginning you may be a novelty, and get a lot of invitations, but those will dry up soon. It's important to accept them to give yourself a bigger pool of possible friends.

It's easiest for children, for people going to school, and for anyone who is working. It's hardest for a non-working spouse, especially if that person doesn't speak the language.