The Bangalore .Net user group is meeting on Saturday, 22nd December at 4:00pm. There will be two sessions covering Spring.Net and NHibernate. More details here.
The Bangalore Open Java user group is meeting on Sunday, 23rd December at 10:30 am. Sessions include a design patterns session (covering strategy and chain of responsibility) and a Ruby/JRuby primer covering 'Why is Ruby different?' and 'What's the big deal with this metaprogramming thing anyway?'. More details here.
These events are open to everyone. You can find directions to ThoughtWorks Bangalore in an older post of mine here.