If you are into software and happen to be close to Bangalore or are willing to travel a bit then this event is highly recommended for the immense amount of learning that can be compressed into just 4 days.

From http://foss.in/faq
<Quote>
Q: Am I qualified to attend FOSS.IN?
A: FOSS.IN is for anyone who is interested in FOSS. However, understand that the focus is contribution to, not use of, FOSS. So if your objective is to contribute (in terms of writing code or documentation, testing, developing artwork, etc.) then FOSS.IN is for you. FOSS.IN has no policy that excludes anyone from attending the event - there is no “qualification” other than your interest in FOSS.
</Quote>

From http://foss.in/about
<Quote>
FOSS.IN is a non-commercial event organised and run entirely by FOSS community volunteers. It does not represent the interests of any commercial entity.
</Quote>

Yahoo! is organizing open hack day at Bangalore, the event announcement with information on registration is online at http://hackdayindia.eventwax.com/hack-day-india

Full Disclosure: I am an employee at Yahoo! SDC Bangalore.