Registration is now open for the fifth annual Million Dollar Bike Ride on Sunday, May 20, to raise money for rare disease research, organized by the Penn Orphan Disease Center.

The ride starts and finishes at Highline Park, 31st & Chestnut Streets. Online registration is open until midnight on Sunday, May 13. Early registration fee: $25 (must raise at least $250 before the event). Walk-up registration ($100) is available at the Class of 1923 Penn Ice Rink on Sunday, May 20 at 6 a.m.

Proceeds will help further research by the Penn Medicine Orphan Disease Center. To register visit: https://tinyurl.com/yb9qg67o

Volunteers are also needed for various tasks and shifts throughout the day of the bike ride, starting at 6 a.m. and ending at 4 p.m. To volunteer: https://tinyurl.com/y896oklb

For more information: www.milliondollarbikeride.org