Final answer:
The notorious event that no one remembered attending, despite tickets being sold and merchandise being purchased, was the infamous Woodstock '99 music festival.
Step-by-step explanation:
The notorious event that no one remembered attending, despite tickets being sold and merchandise being purchased, was the infamous Woodstock '99 music festival. This event took place in Rome, New York, from July 22-25, 1999.
Woodstock '99 was intended to be a revival of peace, love, and music, reminiscent of the original Woodstock festival in 1969. However, it quickly turned into a chaotic and violent event, with rampant vandalism, fires, and sexual assaults.
The aftermath of Woodstock '99 was marked by criticism of the organizers for poor planning and security measures. It serves as a cautionary tale in terms of event management and highlights the importance of ensuring the safety and well-being of attendees.