20in24 Relay Challenge

Philadelphia's running festival around the Schuylkill River Running Loop which includes:

Marathons, Ultramarathons and Multiday Events
Marathon Ultramarathon by distance: 50 km \| 50 m \| 100 km \| 100 miles \| Other distances 26 miles - 100 miles Ultramarathon by time: 6 hour races \| 12 hour races \| 24 hour races \| 48 hour races \| 72 hour races \| marathon \| ultramarathon \| Multiday Races Multiday race by time: 5 Day Races \| 6 Day Races \| 7 Day Races \| 10 Day Races ".." Multiday race by distance: 1000 km \| 700 miles \| 1000 miles \| 1300 miles \| 3100 miles; ".." Types of Races: Stage Races \| Adventure/Raid Races \| Trail Races \| Relay Races; ".."

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