Where do you find upcoming offline/online events, conferences happening in India? Across the world? My focus in on startups, tech, product etc.

meetup.com?

Can you suggest any particular groups that are active and you like?

My groups are mostly related to Data Science. A few of them that are active:- • Tensorflow User Group Pune • 91Springboard Pune • Python Pune • PyData Pune • Thoughtworks (I dont recall the exact name but ThoughtWorks use to have Geek Nights every Thursday).