Stable Isotope Analysis of Busycon Sinistrum to Determine Fort Walton. Period Seasonality at St. Joseph Bay, Florida is presented by Ryan Harke. Learn how research suggests that coastal and inland Fort Walton populations represent separate cultural groups. 7 to 8 p.m. Free; advance registration required. Weedon Island Preserve, 1800 Weedon Drive NE, St. Petersburg. (727) 453-6500; www.weedonislandpreserve.org.