At one of the most premiere business schools in India, IIM (Ranchi), they hosted a "Soul Carnival", with food, games and joy of being related. But with a twist. Here's more from their press release:

However, what sets this year's Soul Carnival apart is reliance on the Trust Economy model – a radical yet resonant approach where transactions at stalls are not fixed by price tags but are left to the discretion and generosity of patrons; the birth of this revolutionary concept was inspired by ServiceSpace movement of kindness and generosity happening globally.

For a deeper dive into various models, check out this article on spectrum of reciprocity (and many practical examples and experiments).