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The Penn Relays (also Penn Relays Carnival) is the oldest and largest track and field competition in the United States, hosted annually since April 21, 1895 by the University of Pennsylvania at Franklin Field in Philadelphia, Pennsylvania. It regularly attracts more than 15,000 participants from high schools, colleges, and track clubs throughout North America and abroad, notably Jamaica, competing in more than 300 events over five days. Historically, the event has been credited with popularizing the running of relay races. It is held during the last full week in April, ending on the last Saturday in April. Attendance typically tops 100,000 over the final three days, and has been known to surpass 50,000 on Saturday.