I just added information about four user groups in Pune to the Groups and Organizations page in the PuneTech wiki: PuneRuby, PuneJava, Pune Linux Users Group (PLUG), and Pune Flex Users Group (PuneFUG). Please take a look at their pages to get an idea of their activities. PLUG and PuneJava have regular meetings. PuneRuby and PuneJava have very active mailing lists. PuneFUG is relatively new, but it looks like they will have regular meetings.
PuneJava has a talk on agile development this Saturday at 6pm. (You should already know this; otherwise subscribe to PuneTech updates!) Just before that, at the same location, PLUG is holding its monthly meeting (see their website for details). Pune Flex Users Group is holding a meeting on Sunday at 5pm (see their wiki for details).
Also, the Pune OpenCoffee Club (for entrepreneurs, and others interested in the startup ecosystem in Pune) is planning on a meeting next weekend. Chip in on that discussion if you want to influence the time/location or agenda.
Update: Rohit points out in the comments that there’s a Pune bloggers lunch on Saturday at 12:30pm.