Upakarma

http://en.wikipedia.org/wiki/Upakarma

Legend of Hyagriva
http://knowledgeavatar.blogspot.com/


Yajur / Sam / Rig Dates
http://www.drikpanchang.com/ceremony/upakarma/yajurveda/yajurveda-upakarma-date-time.html
http://www.drikpanchang.com/ceremony/upakarma/samaveda/samaveda-upakarma-date-time.html
http://www.drikpanchang.com/ceremony/upakarma/rigveda/rigveda-upakarma-date-time.html

Atharva / Dates / Sample
http://www.ramanuja.org/sv/bhakti/archives/jun99/0159.html

http://www.gobookee.net/search.php?q=Atharva+upakarma+
http://www.tribuneindia.com/2001/20010902/calendar.htm

Why Different Dates

During the Mahabharata battle Lord Krishna artificially created an Eclipse to Respect the Sacrifice of Arjuna’s son, Aravan .

The Rig Vedis and the Yajur Vedis were performing the Upakarma on the Poornima Day. This resulted in the change of days  in Thithis, the waxing and waning of the moon.

The next Nakshatra is Avitta. So, the Upakarma was performed  in Avitta  with Poornima by the Yajur Vedis But Rig Vedis  stick to Sravana nakshtra.

Sama Vedis perform this Upakarma in the Pathrapad(Purattasi) in Hastha Nakshatra. Mostly this falls on Ganesh Chaturthi day.

Procedure
http://www.srivaishnavam.com/stotras/upakarma.htm
http://www.vadhyar.com/Upakarma%20Mantram.php

Avani Avittam / Tube
http://www.avaniavittam.org/
https://www.youtube.com/results?search_query=avani+avittam 

Various Languages
http://www.prapatti.com/

Gayatri - Next Day - 1008 Times
http://toessence.blogspot.com/ 

Recipes
http://www.padhuskitchen.com/2013/08/avani-avittam-special-recipes-avani.html

The Veda  teaching begins on the Upakarma Day.

Students will be taught Samhitas, Brahmanas, Aranyakas and Upanishads,

Vedas / Author / Upanishads / Puranas
http://howknowledge.blogspot.com/
http://vyasvyas.blogspot.com
http://vedantaupanishad.blogspot.com/
http://ofancienttimes.blogspot.com/

Uthsarjanam means’ leaving out’ - End of This Term

This shall continue till Pushya Monh, ‘Thai’ in Tamil. The Term will end here by performing ‘Uthsarjan karma’ . This will be performed on the Poornma or the Rohini Nakshatra that occurs before this Poornima.

Rig Vedis and Yajur Vedis follow this.

Sama Vedis end the term in Maaka Month Pornima.

More 

http://www.hindujagruti.org/hinduism/knowledge/article/shravan-vrats-and-rituals.html#2

The term ends here.

Next term begins from the Upakarma Day.

Here the Vedangas,the other Sciences will be taught, Astrology,Astronomy,Linguistics, etc, and so on

Astrology / Astronomy / Sanskrit

http://astrologypath.blogspot.com/
http://astronomyway.blogspot.com/

http://sanskritinfo.blogspot.com/

Holidays

List of Holidays for the students,

Every moth 

1. Full Moon Day,
2. New Moon,
3. Two Ashtamis,(eighth day from Full New Moon/New Moon),
4. Two Chaturdasi (Fouteenth Day from new Moon/Full Month)
5. Then there are three Holidays following the conclusion of each term.

So a student gets 12 Holidays in a year.

In addition to this for unusual circumstances, like Forest fire, Storm’ heavy rains holidays were declared.