The 1999 Mayhem was the inaugural Mayhem professional wrestling pay-per-view (PPV) event produced by World Championship Wrestling (WCW), presented by Electronic Arts. The event took place on November 21, 1999 from the Air Canada Centre in Toronto, Ontario, Canada. Mayhem would be the only non-WWE pay-per-view event at this venue until 2023 when All Elite Wrestling and New Japan Pro-Wrestling held Forbidden Door.

The 2023 Forbidden Door was the second annual Forbidden Door professional wrestling pay-per-view (PPV) event and supershow co-produced by the American promotion All Elite Wrestling (AEW) and the Japan-based New Japan Pro-Wrestling (NJPW). It took place on June 25, 2023, at the Scotiabank Arena in Toronto, Ontario, Canada. It was AEW's first PPV to be held outside of the United States and NJPW's first traditional PPV to be held in Canada. Forbidden Door was also the first non-WWE PPV event to be held in Toronto in what was formally known as the "Air Canada Centre" since World Championship Wrestling (WCW)'s Mayhem event on November 21, 1999.