Revatinandana Dasa: Once, we had a program in Vondel park the whole day. Prabhupada told us, "Just have kirtana, because these people are very degraded. Don't speak much, because if you say the wrong thing, they might become agitated and even violent." I told him that I had experience with these kinds of people and that after ten or fifteen minutes they would often become restless. "Yes," Prabhupada said, "ten, fifteen minutes maximum, and no questions."