I was a member of IIC PSGCAS where i attended 10+ hackathons with several ideas and I also lead my hackathon team twice.
Some of those ideas include "E-Alert" electricity bill alert, "SMART PARKING SYSTEM" automated parking system for malls and "Curator Booking" caretaker booking for elderly and disabled peoples.
I learnt how to deal with failures, out of 10 hackathon I had won only 1, that expericnce thought me how to handle failures.