There is uncertainty about the current year's Summerfest lineup, with some outlets reporting on the 2021 lineup and others referencing 2025 or 2026. The lineup for Summerfest is being reported, with various headliners mentioned, but the exact schedule and details are not consistently clear across outlets. Some outlets have announced specific headliners, including Twenty One Pilots, Chance The Rapper, and Shaggy, but the full and current lineup details are not uniformly confirmed.