Update:

Thanks everyone for your participation!

Please follow this link for the recap: MageStackDay recap

I will sum up all arising questions here. Updates to come.

Is there any personal interactions possible (via skype or whatever)?

We will have some online sessions on Skype/Google Hangout/Slack/whatever. More information to come.

What about people who cannot physically available in particular location (I am from india. I know I would be alone when participate in this event. :-( But having an online support is better right ?)

It's not about going somewhere physically. You can also join from home, your office, wherever. That's what an online-event is all about :-) You can work remote, join the online sessions, join a local event or not (or host one yourself) to gather with people around you.

Do questions divide into different category so that people who are more interested to a particular category can answer that section?

We don't want to overmanage the event. Use your favourite tags on magento stackexchange. If not everyone starts answering on page "1" we should be able to work on several questions at once. And I guess it will naturally happen that people prefer different questions to answer.

Is there any special plans to make this event a great success?

The key to success is the participation of YOU and the magento stackexchange community!