Police have warned people to stick to coronavirus rules after large crowds were seen brawling and drinking in a city park on the day restrictions eased
Videos shared on social media showed some hugging and others pushing and shoving at Nottingham Arboretum.
One local resident described the scenes on Monday as "horrendous".
Police said they had now put a dispersal order in place to prevent similar scenes over the next few days.
Since Monday morning, two households or groups of up to six people have been allowed to meet outside in England.
Footage appeared to show multiple instances of social distancing being ignored as large numbers began gathering from the afternoon and stayed into the evening.
One video showed people pushing and shoving each other and a large amount of litter was left behind.
"Last night it was horrendous seeing what was going on," the resident told BBC Radio Nottingham.
"I walked past on the way to the shop and it was just madness. It seems like a real joke when people are still struggling.
"Staying late, leaving all this rubbish. Every single element of it is completely selfish."
Mature student Thomas Scott, who was in the Aboretum on Monday evening, said: "I felt it was utterly disrespectful.
"There were probably 800 to 1,200 people. When they got kicked out everyone left their rubbish on site."
Pat Robinson, of the Arboretum Residents' Association, said the main culprits were students.
She said: "We are living on a student campus, and they treat the area appallingly.
"I saw so many drunken students, climbing over the railings of the Arboretum, screaming and shouting. There were signs saying no alcohol, but no-one was enforcing it."
