Coasterpedia:On this day/05 20

2023	Matugani, a steel launched roller coaster manufactured by Intamin, opens at Lost Island Theme Park in Waterloo, Iowa, USA
2017	Fireball, a steel shuttle roller coaster manufactured by Vekoma, opens at Furuvik in Gävle, Gävleborgs, Sweden Joker, a steel 4th dimension roller coaster manufactured by S&S Worldwide, opens at Six Flags Over Texas in Arlington, Texas, USA
2016	Fireball, a Super Loop ride manufactured by Larson International, opens at Six Flags New England in Agawam, Massachusetts, USA
2009	ISpeed, a steel launched roller coaster manufactured by Intamin, opens at Mirabilandia in Savio, Emilia-Romagna, Italy
2005	Backlot Stunt Coaster, a steel launched roller coaster manufactured by Premier Rides, opens at Kings Island in Mason, Ohio, USA
2001	Wildcat, a steel roller coaster manufactured by Schwarzkopf, opens at Williams Grove Amusement Park in Mechanicsburg, Pennsylvania, USA
2000	Mega Zeph, a wooden hybrid roller coaster, opens at Six Flags New Orleans in New Orleans, Louisiana, USA Muskrat Scrambler, a steel wild mouse roller coaster manufactured by L&T Systems, opens at Six Flags New Orleans in New Orleans, Louisiana, USA Road Runner Express, a steel family roller coaster manufactured by Vekoma, opens at Six Flags New Orleans in New Orleans, Louisiana, USA Sasquatch, a Combo Tower One Space Shot and one Turbo Drop tower ride manufactured by S&S-Sansei Technologies, opens at Six Flags New Orleans in New Orleans, Louisiana, USA Dizzy Lizzy, a Frisbee ride manufactured by Fabbri, opens at Six Flags New Orleans in New Orleans, Louisiana, USA Mad Rex, a Wipeout ride manufactured by Chance Rides, opens at Six Flags New Orleans in New Orleans, Louisiana, USA Skycoaster, a Skycoaster ride manufactured by Sky Fun 1 Inc., opens at Six Flags New Orleans in New Orleans, Louisiana, USA Spillway Splashout, a Shoot The Chute ride manufactured by Hopkins, opens at Six Flags New Orleans in New Orleans, Louisiana, USA Six Flags New Orleans opens in New Orleans, Louisiana, USA
1995	Mind Eraser, a steel inverted roller coaster manufactured by Vekoma, opens at Six Flags America in Upper Marlboro, Maryland, USA
1976	Demon, a steel roller coaster manufactured by Arrow Dynamics, opens at California's Great America in Santa Clara, California, USA Ameri-Go-Round, a Carousel ride manufactured by Philadelphia Toboggan Company, opens at Paramount's Great America in Santa Clara, California, USA Barney Oldfield Speedway, an Antique Car Ride ride manufactured by Arrow Dynamics, opens at California's Great America in Santa Clara, California, USA Berserker, a Bayern Kurve ride manufactured by Schwarzkopf, opens at California's Great America in Santa Clara, California, USA Carousel Columbia, a Carousel ride manufactured by Chance Rides, opens at California's Great America in Santa Clara, California, USA Centrifuge, a Calypso ride manufactured by Schwarzkopf, opens at California's Great America in Santa Clara, California, USA Eagle's Flight, a Sky Ride ride manufactured by Von Roll, opens at California's Great America in Santa Clara, California, USA Loggers Run, a Log Flume ride manufactured by Arrow Dynamics, opens at California's Great America in Santa Clara, California, USA Orbit, an Enterprise ride manufactured by Schwarzkopf, opens at California's Great America in Santa Clara, California, USA Rue Le Dodge, an Autoscooter ride manufactured by Soli, opens at California's Great America in Santa Clara, California, USA Snoopy's Space Race, an Avio ride manufactured by Barbieri, opens at California's Great America in Santa Clara, California, USA California's Great America opens in Santa Clara, California, USA
1973	Coal Cracker, a Log Flume ride manufactured by Arrow Dynamics, opens at Hersheypark in Hershey, Pennsylvania, USA
1963	Dutch Wonderland opens in Lancaster, Pennsylvania, USA
1958	unknown, a steel kiddie roller coaster, opens at Amusementspark Tivoli in Berg en Dal, Gelderland, Netherlands