Selected references to this day, on the Math's websites.
Disappearance day postings:
Audio:Srila Vrindavan Das Thakur, 1982. A wonderful discourse by Srila Bhakti Raksak Sridhar Dev-Goswami Maharaj about Srila Vrindavan Das Thakur spoken on his disappearance day.
"His heart is so full of devotion towards Nityananda and Sri Gauranga. We pray to him for a drop of that kind of pure and intense devotion towards Gaura-Nityananda from his feet." In the latter part of this recording Srila Guru Maharaj recites and explains the pranam mantrams to Sri Sri Nitai Gauranga composed by Srila Vrindavan Das Thakur.
18 April 1982: 36+ minutes, 8.9 MB mp3 audio
Flying in the Sky. In honour of the disappearance day of Srila Vrindavan Das Thakur, 2012, the translation of a short excerpt from his book Sri Chaitanya-bhagavat in which he expresses his heart and the gist of his gift to the world. Posted on the Math's gaudiyadarshan.com website.
Introduction to Sri Chaitanya-bhagavat (English translation). Srila Bhakti Sundar Govinda Dev-Goswami Maharaj's homage to Srila Vrindavan Das Thakur. Translated excerpt from the introduction by Srila Bhakti Sundar Govinda Dev-Goswami Maharaj to Sri Chaitanya Saraswat Math's Bengali publication of Sri Chaitanya-bhagavat. Posted on the Math's gaudiyadarshan.com website.