Championship (Elite Eight). From 1999 to 2007, Roberts Stadium hosted the Great Lakes Valley Conference basketball tournaments, and in 2013, the same event was held at the Ford Center. A number of Division I NCAA events have been hosted by the city as well. In 1983 Roberts Stadium hosted the first round of the NCAA Men's Division I Basketball Championship, and in 1980 and 1983, it hosted the Midwestern City Conference men's basketball conference tournament. The Ford Center has hosted the Ohio Valley Conference men's and women's basketball tournaments since 2018. Evansville used to play host to the top tier boat racing circuit of H1 Unlimited when it hosted Thunder on the Ohio along the Ohio River in downtown Evansville, which was hosted continuously from 1979 to 2009. Evansville had also previously hosted Thunder on the Ohio from 1938 to 1940. The two-mile Evansville tri-oval was known as one of the fastest hydroplane courses in the world, as various world records were set on the Evansville course. Hydroplane racing returned to Evansville in 2017, with the introduction of the Evansville Hydrofest, an American Power Boat Association event. Goebel Soccer Complex is on of land and features nine Olympic-size irrigated Bermuda grass fields and one Olympic-size AstroPlay turf field. Additionally, Double Cola Soccer Complex provides twin soccer fields and stadium seating for the high school regular season and postseason matches. Swonder Ice Arena is a double-rink facility that opened in the fall of 2002 and features a fitness center, a skate park, and party rooms. High schools in the EVSC district used Lloyd Pool for SIAC swimming and diving meets before its shutdown and demolition plans in 2021. The Deaconess Aquatic Center replaced Lloyd as the local hub for swim and dive in October 2021. Evansville has hosted Drums on the Ohio, a Drum Corps International Summer tour competition at the Reitz Bowl, since 1978 with a brief hiatus from 2008 to 2013. The event normally takes place in June, and draws over 3,000 spectators. It is the only DCI event within a 100 mile radius. Parks and recreation Wesselman Woods Nature Preserve is a National Natural Landmark containing approximately of virgin bottomland hardwood forest, the largest tract of virgin forest inside any city limits in the United States. The Nature Center features exhibits, events, wildlife observation areas, meeting rooms, library, and gift shop. Adjacent to the Nature Preserve, Wesselman Park