Learn how to use an air fryer during a free cooking demonstration at Mentor Public Library with local chef LaDonna Oltmanns. Her demonstration will be 6:30 p.m. Oct. 30, at the Main Branch, 8215 Mentor Ave. She’ll show the air fryer’s easiness and versatility while preparing appetizers, an entree, sides and dessert, according to a news release. The demonstration is free to attend, but due to limited space, registration is required. Sign up at www.mentorpl.org or call the library at 440-255-8811.