I quite like the pot luck concept in which people physically interact and socially connect! It would be interesting to explore how we deal with the organic - ness of preparing something out of leftover for a group of people, given that leftovers vary for every meal for everybody in terms of quantity [no leftover- quite a lot]
Awesome idea Udita ! The teachers/ parents can be given a set of colourful stamps with such phrases instead of the comparative 'Good', 'Very Good', ' x Stars' remarks. Imagine a 'You can do it better / Great job/ You've done better than before' in the notebook.
Some of these encouraging phrases/ expressions could be a appropriately placed in spaces where youngsters spend time, school corridors, sports complex etc.