QI'lop (m.: QI'lopmey)
From PK: A holiday "... which comes every tenth Klingon month is QI'lop. QI'lop celebrates the superiority of the Klingon military. Like most Klingon holidays QI'lop is celebrated with much eating and drinking, but it is also marked by a very peculiar custom, a guest brings a large dish of stuffed to'baj legs to a host's house and in return is allowed to take any nonsacred item in the house. The actual origin of this custom is obscure."