Celebration ceremonies in Iskcon Sri Lanka (Album with photos)
Srila Prabhupada: The only sacrifice recommended in this age is the chanting of the Hare Krishna mantra because in this age it is not possible to accumulate the needed funds for performing sacrifices, not to speak of finding expert brahmanas who can chant the mantras perfectly. (Srimad Bhagavatam, 4.4.32 Purport)
Find them here: https://goo.gl/Cp8XE4