Just by seeing or joining chanting, people will derive tremendous benefits

SB 2.4.15

yat-kīrtanaṁ yat-smaraṇaṁ yad-īkṣaṇaṁ
yad-vandanaṁ yac-chravaṇaṁ yad-arhaṇam
lokasya sadyo vidhunoti kalmaṣaṁ
tasmai subhadra-śravase namo namaḥ

Let me offer my respectful obeisances unto the all-auspicious Lord Śrī Kṛṣṇa, about whom glorification, remembrances, audience, prayers, hearing and worship can at once cleanse the effects of all sins of the performer.

The process of Kṛṣṇa consciousness should be very vigorously propagated all over the world. Simply by seeing the Deity or simply by joining in chanting of the Hare Kṛṣṇa mantra, people will derive tremendous benefit. If one performs kīrtana, chanting, one will be able to think of Kṛṣṇa. One may think, “I danced for two hours and chanted Hare Kṛṣṇa. What is the meaning of this?” This is smaraṇa, thinking of Kṛṣṇa. One may even think, “I foolishly chanted ‘Kṛṣṇa, Kṛṣṇa’ for two hours.” But that also is smaraṇa. Because the Kṛṣṇa consciousness movement is spreading, people are purchasing our books about Kṛṣṇa. Because they are curious they say, “What is this Kṛṣṇa? Let us see the book.” Then they immediately see a picture of Rādhā and Kṛṣṇa, and if they open the book they will see more. In the book there are many prayers glorifying Kṛṣṇa. So some will hear about Kṛṣṇa, and others will read, and if they are fortunate enough they will become Kṛṣṇa conscious and engage in the worship of the Deity. These methods of devotional service – hearing, chanting, remembering Kṛṣṇa, and so on – are so perfect that as soon as one takes to them (either all of them, some of them, or even one of them) one becomes purified. Therefore Śukadeva Gosvāmī prays, “I offer my worship to the Supreme Personality of Godhead, for simply by remembering Him, simply by glorifying Him, or simply by seeing Him, so many benefits follow.”