Where was Def last concert?

As of my last knowledge update in September 2021, Def Leppard's most recent concert listed on their official website was held on August 15, 2021, at PNC Bank Arts Center in Holmdel, New Jersey, USA. It's possible that they have performed other concerts after this date that may not be reflected in my records.

Since concert lists on official websites can change, I recommend checking a more up-to-date source, such as Def Leppard's official website or reputable music news sites, for the most current information on their past concert dates and upcoming concert schedule.