Which premium generated the highest change in MLB attendance?

Question

Quizplus · Accepted Answer

Team history tribute events have been shown to have the highest impact on MLB attendance. These can take the form of themed nights, throwback uniforms, or other tributes to the team's history. Pet day and autograph sessions may be popular with certain fans, but they are unlikely to have as broad appeal as a team history tribute. College night may attract a younger demographic, but may not have as significant of an impact on overall attendance.

Which Premium Generated the Highest Change in MLB Attendance