So far as girls or boys lecturing in the morning, that doesn't make any difference. Either girl or boy devotees may deliver lecture if they choose to do. We have no such distinction of bodily designations, male or female. Krishna Consciousness is on the spiritual platform. As such, anyone who is a devotee of the Lord, following in this line of disciplic succession, can deliver lecture, on the teachings of Bhagavad-gita, Srimad-Bhagavatam, etc.
Letter to Syama dasi, 21 October, 1968