The polo game between Chitral and Gilgat has been played for the centuries. Indeed Gilgate is considered the birthplace of polo. The game takes place every summer, in July, near the Shandur pass. At 3734 meters, this polo field is the highest in the world.
Hat-tip to Susanna Forrest and to W(EI)BPCT, the official website of The World (Excluding India) Bicycle Polo Championship Tournament. Follow the W(EI)BPCT here.