From one hostile environment to another, the documentaries and dramas ranging from Nigeria and Syria to British immigration give vivid life to an experience that can feel very remote As World Refugee Day approaches on Saturday, this year’s Refugee Week offers a multitude of events taking place across the UK, including a film festival that takes audiences from Ain el-Helweh – Lebanon’s largest refugee camp for Palestinians – in Mahdi Fleifel’s A World Not Ours and to an immigration removal centre