A list of events that occurred on May 29 related to Six Flags.
- 1971 – Six Flags Magic Mountain opens as Magic Mountain, a development of the Newhall Land and Farming Company and Sea World Inc.
- 1976 – Six Flags Great America opens as Marriott's Great America, one of two parks built by the Marriott Corporation.
- 2021
- Six Flags Hurricane Harbor Rockford opens for the 2021 season.
- Six Flags Hurricane Harbor Chicago opens for the 2021 season.