I want to know the answer to the following question:
What major event in India in 1857 caused migration of peformance artists into Hyderabad?
All the background I'm provided with is that "After the fall of Delhi in 1857, the migration of performing artists to the city particularly from the north and west of the Indian sub continent, under the patronage of the Nizam, enriched the cultural milieu.". Is that enough to answer the question?