Pictures have been released showing the damage done to parts of Wollaton Park after the Stealth Halloween Festival.
The grounds behind Wollaton Hall, near the lake, appear to have been churned up by large vehicles and machinery after the heavy rainfall at the start of the weekend.
Large track marks and piles of mud can be seen at the site of the festival which took place on Saturday, October 26 to Sunday, October 27.
William Wrigley, 38, of Wollaton, was out walking his dog on Monday morning, (October 28) when he noticed the damage.
He said: "Before the festival started I was concerned about the use of heavy goods vehicles and machinery on the ground at this time of year, especially with the heavy rain.
"When I walked by this morning I was shocked to see the state of the ground - it was like something from the Somme."
The DHP Family, which also organises Splendour, debuted its Halloween event to coincide with (nightclub) Stealth's 15th anniversary and around 6,000 people were expected to attend.
Despite the heavy rainfall which battered the region for around 28 hours from 12noon on Friday, organisers confirmed the event would go ahead.
"It's not really about it happening but how it can be remediated," Mr Wrigley added.
"I can't understand why it wasn't thought about before, especially looking at the weather forecast."
Responding to the criticism and pictures, Patrick Loy, head of events at Nottingham City Council, said: “Every event is unique and we learn lessons from each one that we host.
"The wet weather at the end of last week, particularly on Saturday, was challenging and extra measures were in place to try to mitigate against the effects of the rain.
“The council receives a fee from organisers for any event on our land. In addition, agreements are made in advance that the cost of any damage to parkland will be met, in full, by the promoters. It’s important to be clear that no taxpayers’ money will be spent here on restorative works.
“This is on top of the proportion of the ticket price charged to organisers to ensure continued investment – safeguarding our venues for future generations. It funds wider projects at Wollaton and this particular event subsidy will be spent on improving paths through the park."
“We already have a plan in place to correct the damage caused this weekend.”
A spokeswoman for Stealth added: "With heavy rain forecast, we took significant steps to ensure we could stage a safe and enjoyable Halloween event this weekend at Wollaton Park.
"Several hundred metres of additional pedestrian flooring was ordered on Thursday in light of the forecast and bark chippings were laid to soak up water logged areas.
"The substantial flooring in the marquee, pedestrian trackways and water drainage channels put in place for the festival meant we were able to go ahead and welcome 6,000 people.
"All of the hard work of the staff involved, who were out monitoring the condition of the site and laying more bark chippings as and when needed, and the raft of measures we put in place meant we were able to go ahead with the second day with no issues at all.
"Despite the heavy rainfall which scuppered many others over the weekend, the event was a resounding success with no reports of injuries or anti-social behaviour.
"Inevitably, there is a short term impact on the ground in the area caused by the heavy vehicle movement during site set up and breakdown. This will be speedily repaired so the park can continue to be enjoyed by the many. The cost of any remedial work required to restore the park to its former condition is met by the festival."
