Superhero event: The Akron-Canton Comic Con starts at 10 a.m. at Chapparells Community Center, 2418 S. Arlington Road, Coventry Township. The convention will feature comic books and related collectibles. There will be displays and a cosplay contest. Admission is $5 with kids age 6 or younger free.

 

River event: Great Lakes Science Center in Cleveland is offering free admission Sunday to mark 50 years since the Cuyahoga River caught fire, inspiring efforts to revitalize the waterway. The harbor area outside the museum will have displays and exhibits, too. The center is at 601 Erieside Ave.