Every April, athletes from around the globe make history at Franklin Field.

In 2015, 16,368 high school, college, and professional athletes are competing in the 121st running of the Penn Relays, which is being held from Thursday, April 23 through Saturday, April 25.

Drawing students from 235 colleges and 1,023 high schools, the Penn Relay Carnival is the oldest organized relay competition and the largest amateur track meet in the United States.

For the event, athletes traveled to Philadelphia from high schools and colleges in 36 states and eight countries, including Jamaica, which has 37 high schools registered—more than all but five U.S. states.

On April 23, the Penn women’s track and field team won their 4x100 heat to advance to the final, and the women’s team from Villanova University excelled in the distance medley relay, garnering their fourth consecutive win.

Saturday’s USA vs. the World events feature Olympic and World Championship medalists and other outstanding athletes from nine countries, including the Bahamas, Botswana, Brazil, Canada, China, Nigeria, Guyana, Jamaica, plus a team of Caribbean All-Stars.

But the highlight of this year’s Penn Relays may be 94-year-old George Scott. Originally from South Philadelphia, Scott is running the 100-meter dash on Saturday afternoon.

Established in 1895, the first Penn Relays attracted 5,000 people. This year, Penn’s urban, tree-lined campus is welcoming more than 110,000 visitors.

Over the years, track legends such as Usain Bolt, Carl Lewis, Asafa Powell, Justin Gatlin, Michael Johnson, Allyson Felix, and Sanya Richards-Ross have competed in the Penn Relays.

Competitions include the javelin throw, pole vault, distance medleys, discus throw, hurdles, long jump, and the high jump.