APPEARANCE DAY (Śrī Vyāsa-pūjā) — Vāmana māsa, Kṛṣṇa pakṣa, caturthi tithi
(Usually one day before appearance day of Vakreśvara Paṇḍita, except when the caturthi tithi is kṣaya or vṛddhi)

2012:

Jun 7th for USA, Canada, Europe, Israel;
Jun 8th for India, China, Philippines, Australia, New Zealand, Fiji

2013:

Jun 26th for USA, Canada, Europe, Israel;
Jun 27th for India, China, Philippines, Australia, New Zealand, Fiji

DISAPPEARANCE DAY — Govinda māsa, Gaura pakṣa, pratipat tithi
(Same day as disappearance day of Jagannātha dāsa Bābājī and Rasikānanda Ṭhākura)

2012:

Feb 22nd for USA, Canada, Europe, Israel, India, Beijing, Hong Kong;
Feb 23rd for Shanghai, Manila, Australia, New Zealand, Fiji

2013:

Mar 12th for USA, Canada, Europe, Israel, India, China, Philippines;
Mar 13th for Australia, New Zealand, Fiji

You can listen to or download all of His Holiness Tamal Krishna Goswami’s lectures at tkgtm.com

sākṣād-dharitvena samasta-śāstrair
uktas tathā bhāvyata eva sadbhiḥ
kintu prabhor yaḥ priya eva tasya
vande guroḥ śrī-caraṇāravindam

The spiritual master is honored as much as the Supreme Lord because he is the most confidential servitor of the Lord. This is acknowledged in all revealed scriptures and is followed by all authorities. Therefore I offer my respectful obeisances unto the lotus feet of my spiritual master, who is a bona fide representative of Sri Hari. [Śrīla Viśvanātha Cakravartī Ṭhākura,  Gurv-aṣṭaka, verse 7]

yasya deve parā bhaktir
yathā deve tathā gurau
tasyaite kathitā hy arthāḥ
prakāśante mahātmanaḥ

Only unto those great souls who have implicit faith in both the Lord and the spiritual master are all the imports of Vedic knowledge automatically revealed. [Śvetāśvatara Upaniṣad, 6.23]