Thanksgiving at Work is an initiative where both employees and leaders are given the chance to engage and interact in a casual atmosphere, enjoying great food and contributing to a monthly topic of the different aspects of gratitude. While the definition of gratitude varies between individuals, the tradition of Thanksgiving and food culture, in general, could work as a common ground.
Every monthly Thanksgiving could start by giving thanks for the great food that could be cooked together, delivered or else, depending on the company size and budget. Then, in smaller groups or with the whole team, employees and leaders could volunteer on sharing their thoughts and anecdotes on the monthly topic around gratitude - e.g.: "What I am thankful for in my career so far/What I have learned about appreciation as a leader / I am thankful for the failure XYZ /"
The list of topics could be crowdsourced by the people. Also, Thanksgiving at Work could be implemented into a corporate social platform, where people could vote for the next monthly topic, decide for their preferred meal or recipe and share thoughts and pictures of the monthly gathering.
To add an educational aspect to the concept, a zero-waste meal could be offered, e.g. cooked out of legally 'rescued' food/in cooperation with initiatives like Resq or Foodsharing. That's how discussions at the table could support conviviality and an increased consciousness for sharing gratitude.
The purpose of this idea is to bring people together in a surrounding where gratitude comes almost naturally into play whereas feedback tools and other might be helpful on peer-to-peer and serve a benefit for performance management, though I do believe that these more community-like events could help smaller and bigger corporations to start shifting their culture as a whole, while letting the people decide and contribute to a shared experience.