I am curious as to the reason(s) for your question. Is there anything wrong with it (convocations), and if so what is it?
I think that such a convocation allows for parents and their graduating sons/daughter, aunts, uncles and cousins and supporting friends to congregate together at a venue where the graduands have the spotlight on them for a few fleeting moments. Why deny them that? I am baffled. The parents will be deservingly proud, and the younger siblings still in school will also want to go to universities... the nation is the better for it, and certainly India can have more minds who address many of the country's myriad problems that still persist even into the 21st century.
A graduation ceremony is what finally allows a university or an educational institution to metaphorically say to the graduand “Well done, you have been persistent, you have toiled, you have not thrown in the towel, you have conquered your weaknesses, and you have emerged victorious! And now you must go forth with courage to meet the challenges that life will surely throw at you… and godspeed!”
I come from the IT industry and we have a saying “If it ain’t broken, don’t try to fix it”!”
I wonder how and in what way you will you set about changing a long-held practice in most universities around the world. I wonder what improvements you or even Mr/Ms Mandaviya will want to make. And how would such improvements help?