The funeral of former Iranian leader Ayatollah Ruhollah Khomeini in 1989 drew an estimated 10.2 million attendees in Tehran alone, making it the largest funeral attendance ever recorded.
Imam Khomeini Funeral Draws Record 10.2 Million in Tehran
View original (untranslated) text
— For reference: Imam Khomeini’s funeral in 1989 attracted 10.2 million people in Tehran alone It’s the largest funeral attendance in recorded history.