Appearance festival of
Om Vishnupad Paramahamsa Parivrajakacharyya varyya Astottara sata
Sri Srila Bhakti Raksak Sridhar Dev-Goswami Maharaj.

Selected references to this day, on the Math's websites.

Audio: Sri Vyasa Puja address, 1985, to the gathered assembly. Srila Bhakti Raksak Sridhar Dev-Goswami Maharaj expresses appreciation and makes a heartfelt appeal to the gathered devotees from India and around the world.
Sri Vyasa Puja, 7 November 1985 (excerpt):
8 minutes, 1.9 MB mp3 audio

Sri Guru Puja Editorial, 1956. Srila Bhakti Sundar Govinda Dev-Goswami Maharaj describes the fortune of the soul with and without the grace of Sri Guru. Translated from the Bengali editorial published in Sri Gaudiya Darshan, November 1956, in honour of the appearance day of Srila Bhakti Raksak Sridhar Dev-Goswami Maharaj, and posted in English on the Math's gaudiyadarshan.com website.

Audio: Srila Sridhar Maharaj on his own Sri Vyasa Puja day 1985. A very sweet audio recording of Srila Sridhar Maharaj spoken on 7 November 1985, his own Vyasa Puja Day, that is referred to in Sripad Sagar Maharaj's article published in Dignity of Divine Servitor:
"The day after Srila Guru Maharaj gave Srila Govinda Maharaj sannyas was Guru Maharaj's own Appearance Day and he was very happy on that day. Early that morning I went to see him and said, 'Srila Guru Maharaj, yesterday you gave Srila Govinda Maharaj sannyas; but I think he took sannyas many, many lifetimes ago.'
"He replied, 'Oh, you want to say that this is only being done to show the people who he is, but actually he is much more than that?' Srila Guru Maharaj was smiling and laughing, and on that morning, his own Appearance Day, he sat on his chair and for maybe two or three hours he talked about Srila Govinda Maharaj. This was the Appearance Day of the Guru but the Guru was doing kirttan of the disciple!"
This recording is of only 26 minutes. If anyone has the remainder of this talk, please let us know so we can share that, too, for the satisfaction of Srila Guru Maharaj.
26 minutes, 6 MB mp3 audio

1961 Vyasa Puja Offering. Srila Bhakti Sundar Govinda Dev-Goswami Maharaj's prayer on the appearance day of Srila Bhakti Raksak Sridhar Dev-Goswami Maharaj. Originally published in Sri Gaudiya Darshan of November 1961, and posted now with accompanying transliteration and English translation on the Math's gaudiyadarshan.com website.

Audio: Hapaniya Festival, the day after Srila Guru Maharaj's Vyasa Puja 1989. Srila Govinda Maharaj describes the glories of Srila Bhakti Raksak Sridhar Dev-Goswami Maharaj and his holy place of appearance, Sripat Hapaniya.
"Srila Guru Maharaj is transcendental form, not mundane, so when his appearance day comes we can worship him in the way of Lord Krishna or Mahaprabhu. I think it will be very good that if after the Nabadwip festival we make here, next day, a festival that will be like Nandotsav... Everything here is transcendental, if we can see that, we must be benefited."
Hapaniya, 24 October 1989:
29+ minutes, 6+ MB mp3 audio

Sri Vyasa-Puja Address in our Lahta Temple, Russia. Discourse given by Srila Bhakti Sundar Govinda Dev-Goswami Maharaj in Saint Petersburg during the main festival programme of Sri Vyasa-Puja of Srila Bhakti Raksak Sridhar Dev-Goswami Maharaj. English class with Russian translation. Srila Gurudev then leads the singing of 'Sri Guru Arati-stuti' composed by himself in glorification of Srila Guru Maharaj. (2006)
Download, or listen online (47+ minutes, 6.1 MB mp3 audio)
or:
higher quality (11 MB mp3 audio).

Sri Vyasa-Puja Bengali class by Sripad B.N. Acharyya Maharaj in the nat-mandir of Sri Chaitanya Saraswat Math on the 111th Anniversary Festival of the Appearance of Srila Bhakti Raksak Sridhar Dev-Goswami Maharaj (2006).
Download, or listen online (9 minutes, 1 MB mp3 audio).

A Day at Hapaniya, a lecture delivered by Srila Bhakti Sundar Govinda Dev-Goswami Maharaj at the Advent Festival of Srila Bhakti Raksak Sridhar Dev-Goswami Maharaj, October 1989. First published in Sri Chaitanya Saraswati, Vol. I. (50 K PDF document.)

Our Wealth and Our Life: The Holy Appearance Day of His Divine Grace Srila Bhakti Raksak Sridhar Dev-Goswami Maharaj. Extensive, substantial article by Jagamohini Devi Dasi written for Srila Guru Maharaj's Appearance Festival, 2006.

Newly received pictures of Srila Guru Maharaj Srila Bhakti Raksak Sridhar Dev-Goswami Maharaj, kindly given by Kshamabuddhi Prabhu to share with the devotees worldwide.

Your Most Fortunate Position by Srila Bhakti Raksak Sridhar Dev-Goswami Maharaj. This discourse was originally published in The Divine Message in 1984. (44 K PDF document.)

Sri Guru-Prasastih. Composition in glorification of the holy appearance of Srila Bhakti Raksak Sridhar Dev-Goswami Maharaj by Srila Bhakti Sundar Govinda Dev-Goswami Maharaj. Transliteration with English translation, originally printed in Srila Guru Maharaj, His Divine Pastimes and Precepts in Brief. (100 K PDF document.)

Srila Guru Maharaj Remembers. From a recorded conversation with His Divine Grace Srila Bhakti Raksak Sridhar Dev-Goswami Maharaj, originally printed in Srila Guru Maharaj, His Divine Pastimes and Precepts in Brief. "I was born at midnight, Saturday 10th October, 1895. Navami tithi [lunar day] under the same sign as Lord Ramachandra...." (140 K PDF document.)

Srila Guru Maharaj's Bhajan Kutir decorated for His Divine Grace's 112th Sri Vyasa-Puja Festival (2006). (Pictures.)

Five pages of black and white archive photos and excerpts 'Meditations in Pictures and Words' of Srila Bhakti Raksak Sridhar Dev-Goswami Maharaj.