OGDENSBURG – On Friday, Sept. 20,  join the Fort La Présentation Association on a tour of the night sky with amateur astronomer Dr. Tim Abel on the Abbé Picquet Trail on the grounds of Fort de la Présentation, 22 Albany Ave. Dr. Abel will have his 12-inch Dobsonian telescope on the Fort de la Présentation field starting at dusk, weather-permitting. The Association will also host Linda Besio, from the Nicandri Nature Center in Massena, offering the program, Bats of Northern New York. Visitors will have an opportunity to chat with a naturalist about local bat species, cool bat facts, and how bats are beneficial. Saturday, Sept. 21, is the rain date. www.fort1749.org .