An event due to take place this weekend, a Collectors Car sale, has been postponed.
The venue had also due to host the Auckland Food Show, Home Show and Baby Show in coming weeks, as well as several concerts in its auditorium, called the Logan Campbell Centre.
The Showgrounds will be closed to the public tomorrow.
In March the Herald reported on the venue's uncertain future as the site struggled to see how it could remain solvent in the face of major event cancellations due to Covid-19.
The only profit for the 8 hectare Cornwall Park showgrounds is from shows, events and concerts.
As of March 2021, the venue had lost four major events, including the Home Show and the Royal Easter Show.
In 2020, 14 major events were cancelled due to the pandemic, plus 11 smaller shows and concerts.