This week’s theatre round-up features a refugee children’s story, Marys Seacole at the Donmar and Punchdrunk’s new immersive production. The Burnt City – One Cartridge Place ★★★★☆ When a pandemic hits, your first thought probably isn’t: “Oh god, what will happen to immersive theatre?” But after two years without touch, there’s an excited, dangerous buzz as we step into the …