The Delhi unit of Shiv Sena had earlier threatened to disrupt the two-day Sindhi Sufi Music Festival if musicians from Pakistan were allowed to perform, following which the organisers had sought police protection.
The protesters reached the venue on Janpath to stage a protest but were detained by the police and were taken to Parliament Street police station, police said.
Organisers said the same group had tried to disrupt the event last year as well.