A "kora" is a sort of pilgrimage mixed with a religious contemplative practice that takes place in Tibet near locations of great religious importance. One of the most renowned is the kora that runs down Barkhor Street, surrounding the old Jokhang shrine, Tibet's most sacred and venerated shrine. You can visit this in your Tibet Overland tours. https://theexploretibet.weebly.com/blog/discover-ancient-traditions-spiritual-koras-and-the-timeless-soul-of-the-himalayas