It's somewhat frightening for a new international student to come to a new country, a strange meeting, and stand around alone wondering what's going on. The atmosphere is helped by a relaxed room, some colorful posters, tea, and something for people to munch on. If you sing, be sure to choose simple, applicable songs. Sing songs which your international friends can join in on, and don't make liars out of them. Introduce the evening's program.
People are more relaxed when they know what's going to happen.
Let everyone share their name, country, something personal, such as what they're studying, what they find funny or strange in the culture here, what they like to eat for breakfast, or something else unusual. This will get people laughing and relaxed. Be sure to take time for people. Use people's names in conversation, they appreciate it, and it makes them feel more at home. If you get Christian international students involved in leading the meeting, they'll help the atmosphere be truly international.