When Patrick Dempsey isn't too busy starring in TV shows like Grey's Anatomy or blockbusters like the latest Transformers flick, he apparently enjoys leading groups of cyclists through Tucson's Armory Park neighborhood, which is exactly where he'll be on Sunday afternoon.

The event, called "Ride On, Tucson!" will be held from 1 to 4 p.m. this Sunday, and will include a 2.2-mile ride, looping through the area around the park. Tom Danielson, a professional cyclist who has placed within the top 10 at the Tour de France, and Peter Flax, editor-in-chief of Bicycling Magazine, will also host the event and lead the ride alongside Dempsey. According to the event's Facebook page, Dempsey and Danielson formulated the idea "to celebrate the great bicycling community in Tucson and Pima County."

The event will also feature live music at Armory Park from Jovert, the Tucson Magnet High School's steel drum band, and local progressive bluegrass band Determined Luddites. Attendees can also receive free event posters signed by Dempsey and Danielson.

The event is free, and bicycle mechanics will be on-hand to change flat tires and make other small repairs at no cost. Helmets are required to participate, and the event is scheduled to happen rain or shine. More information on the event can be found here.