The CU Heritage Center will present a slideshow lecture and guided tour on "Bats in the Old Main Belfry" on Wednesday, Aug. 28, at 6 p.m. in Old Main Chapel on the CU-Boulder campus. Rick Adams, president of the Boulder chapter of the Colorado Bat Society, will discuss the bats that live in the attic of Old Main. The event will move outside to view bat exit holes and, with luck, bats in flight. The event is free and open to the public. A reception with light refreshments will take place at 7 p.m. before the guided walk at dusk.