Hey, bicyclists. Tired of the Towpath? Bored with the Hike & Bike? Check out today’s free public gathering at Ohio City Bicycle Coop for a tantalizing alternative. Jim Sayer, avid cyclist and executive director of Adventure Cycling Association, will be on hand to tell you all about the new 518-mile Detroit Alternate — a spur to the original 2,000-mile Underground Railroad bike route stretching from Mobile, Alabama to Owen Sound, Ontario. The new spur begins in Oberlin, an important hub in the 1800s’ escape route, and passes through Sandusky, Toledo, and Detroit before heading into Canada. The route goes along established roadways, with an eye toward safety, accessibility, and historic import. Adventure Cycling’s contribution is researching and mapping the routes, as a way to inspire people of all ages to travel by bike. The nonprofit also sells maps, biking guides, and memberships to support the mission; so far, they claim more than 43,500 members nationwide. “The boom in bike travel has been huge,” Sayer says. “It cuts across all demographics.” He’ll tell you more at 8:30 p.m. It’s free, although attendees are invited to bring a dish to share or a cash donation for the potluck.