http://www.aptclasses.com/. It has listings for classes in Bangalore, Chennai, Mumbai, Delhi, Kolkata and Ohio in US.
I could find so many different categories listed, be it instruments, art, cooking, sports, yoga, languages, mehendi and lots more. Each has a sub division, so you can look up violin, veena, piano, guitar, flute, kanjira etc. and even something I have not heard of like "konnakol" under instruments. There are lots of categories and you might be sure to check it out.
