Next event of RHoK is scheduled on 11th July at resourceful Workbench Projects. More details here. Based on my experience of Dec 2014 event, I can definitely recommend that it will be worth participating and contributing.
Last Sunday, I attended RHoK‘s Bangalore event at beautiful CIS. This was second event for RHoK for 2014 in Bangalore. Hacks coming out of RHoK are maturing and trying to solve important issue rather than just being additional feature on some random online project, which makes this event different from other events.