Tamal Krishna Goswami: By letter, I described a pandal, a large outdoor public program that we were arranging for ten days, and I asked Prabhupada, “Are you willing to come? If you are, we will advertise.” Prabhupada was in Australia on his way back to India, and he sent me a telegram, “You preach if mass, I preach if class.” That’s all it said.
Source: Remembrances by Sidhanta Das – Folio Vedabase