When the Lord was at Vārāṇasī, the people in general became more attracted to Lord Caitanya Mahāprabhu on account of His mass saṅkīrtana movement. Wherever He visited, especially the Viśvanātha temple, thousands of pilgrims would follow Him. Some were attracted by His bodily features, and others were attracted by His melodious songs glorifying the Lord. The Māyāvādī sannyāsīs designate themselves as Nārāyaṇa. Vārāṇasī is still overflooded with many Māyāvādī sannyāsīs. Some people who saw the Lord in His saṅkīrtana party considered Him to be actually Nārāyaṇa, and this report reached the camp of the great sannyāsī Prakāśānanda.
(Srimad Bhagavatam Introduction).

Śrī Caitanya Mahāprabhu divided His saṅkīrtana party into seven divisions. With two mṛdaṅgas in each division, there were altogether fourteen mṛdaṅgas. While performing kīrtana, Śrī Caitanya Mahāprabhu exhibited various symptoms of transcendental ecstasy, and Jagannātha and Śrī Caitanya Mahāprabhu exchanged Their feelings very blissfully. When the cars reached the place known as Balagaṇḍi, the devotees offered the Deities simple food. At this time, in a nearby garden, Śrī Caitanya Mahāprabhu and His devotees took a brief rest from the dancing.
(Sri Caitanya Caritamrta--2:13--summary).

One may sell books or enlist life members or render some other service, but these duties are not ordinary duties. These duties serve as an impetus for remembering Kṛṣṇa. When one goes with a saṅkīrtana party or sells books, he naturally remembers that he is going to sell Kṛṣṇa's books. In this way, he is remembering Kṛṣṇa. When one goes to enlist a life member, he talks about Kṛṣṇa and thereby remembers Him. Smartavyaḥ satataṁ viṣṇur vismartavyo na jātucit. The conclusion is that one must act in such a way that he will always remember Kṛṣṇa, and one must refrain from doing things that make him forget Kṛṣṇa. These two principles form the basic background of Kṛṣṇa consciousness.
(Sri Caitanya Caritamrta--2:22:113--purport).

The Kazi came to Śrīvāsa Paṇḍita's house and broke a mṛdaṅga (khola drum) there and declared that unless Nimāi Paṇḍita ceased to make noise about his queer religion he would be obliged to enforce Mohammedanism on him and his followers. This was brought to Mahāprabhu's notice. He ordered the townspeople to appear in the evening, each with a torch in his hand. This groups, and on his arrival in the Kazi's house, he held a long conversation with the Kazi and in the end communicated into his heart his Vaiṣṇava influence by touching his body. The Kazi then wept and admitted that he had felt a keen spiritual influence which had cleared up his doubts and produced in him a religious sentiment which gave him the highest ecstasy. The Kazi then joined the saṅkīrtana party. The world was astonished at the spiritual power of the Great Lord, and hundreds and hundreds of heretics converted and joined the banner of Viśvambhara after this affair.
(Teachings of Lord Caitanya).

After the mass nagara-saṅkīrtana in protest against the magistrate Chand Kazi, the Kazi was converted to a devotee. Then Śrī Caitanya Mahāprabhu returned with His saṅkīrtana party to the house of Śrīdhara, and Chand Kazi followed Him. All the devotees rested there for some time and drank water from Śrīdhara's damaged iron pot. The Lord accepted the water because the pot belonged to a devotee. Chand Kazi then returned home. The place where they rested is still situated on the northeastern side of Māyāpur, and it is known as kīrtana-viśrāma-sthāna, "the resting place of the kīrtana party."
(Sri Caitanya Caritamrta--1:17:70).

The conclusion is that in order to get freed from the material disease, one must take to the chanting of the Hare Kṛṣṇa mantra. The Kṛṣṇa consciousness movement is especially meant for creating an atmosphere in which people can take to the chanting of the Hare Kṛṣṇa mantra. One must begin with faith, and when this faith is increased by chanting, a person can become a member of the Society. We are sending saṅkīrtana parties all over the world, and they are experiencing that even in the remotest part of the world, where there is no knowledge of Kṛṣṇa, the Hare Kṛṣṇa mahā-mantra attracts thousands of men to our camp. In some areas, people begin to imitate the devotees by shaving their heads and chanting the Hare Kṛṣṇa mahā-mantra, only a few days after hearing the mantra. This may be imitative, but imitation of a good thing is desired. Some imitators gradually become interested in being initiated by the spiritual master and offer themselves for initiation.
(Nectar of Instruction).