The Kosh'harg celebration (also known as the Kosh'harg festival) was a biannual event held by the diverse and numerous orcish clans of Draenor. It took place during the spring and the autumn, in honor of the time when day and night are the same length. Because of the vast differences in culture, dress, religious dogma and dialects between all the orc clans, they were generally insular and independent cells. However the elders of all clans recognized the importance of meeting to discuss various matters, and thus the Kosh'harg was created and honored.
Kosh'harg was always held in the shadow of Oshu'gun, the "Mountain of Spirits" in Nagrand. Any violence or vendettas pursued during the event was strictly forbidden and held grave consequences, since Nagrand was considered holy ground. The length of the festival depended on how many pressing concerns needed to be addressed, but such matters were a rarity, and the gathering shifted much more to the mood of a festival rather than a commune. Many Kosh'hargs were simply meet-and-greets to catch up and see old faces once more.