Bangalore has more tech meetups than anyone can attend, so it helps to be choosy. For security learners, OWASP Bangalore and null Bangalore are the obvious picks. They meet regularly, often together, sometimes with Garage4Hackers as well, and the meetings are free and open to anyone.
If you are doing an online course in ethical hacking or application security from Bangalore, go to one of these combined meets, listen to a few talks, and stay for the conversations afterwards. Many attendees work in security teams around the city and are happy to point a newcomer toward labs, tools or certifications. Once you are confident, volunteering to present a short session is a very good way to build a reputation.
Independent community groups, listed for reference. They are not run by or affiliated with WebAsha.