Although I have looked quite hard, I have failed to find out if this years grand show in June is definitely cancelled.
2022 is on and I would be extremely surprised if this years show was on, especially with rising Covid-19 cases across Europe. Putting on a show would be expensive and it is unlikely many would want to be there in big crowds with the pandemic, even if they could travel.
The last definitive information I saw was that Dayton, USA was cancelled and Friedrichshafen 2021 was to be decided still. However, Southgate News is reporting that it is cancelled this year.
See http://www.southgatearc.org/news/2021/march/ham-radio-exhibition-once-again-suspended.htm#.YGBoEyvYrrc .
It is definitely not happening in 2021. I have found the official announcement of this. A pity, but understandable.
See https://www.hamradio-friedrichshafen.com/no-get-together-in-2021-ham-radio-exhibition-once-again-suspended
Notice the word "suspended" . There is an online event June 25th - 27th 2021.