Ganga Mayi Dasi: We used to attend many outside programs at this time, in the homes of Brijbasis. Prabhupada usually only spoke in Hindi, so once Guru Das wanted to leave. Prabhupada forced him to stay, to show respect to the host, and to train his disciples in the practice of Vaisnava etiquette.
Reference: Prabhupada at Radha Damodara by Mahanidhi Dasa