People who break a new law, which comes into force on Wednesday amid a spike in Covid-19 cases, will be fined.
Mixing between households in indoor settings, such as pubs and restaurants, will be illegal.
A council leader said a lack of detail about the restrictions had led to people spreading half truths and myths.
Education minister Gillian Keegan said the new measures would "be laid out and it will be clear to people in those areas".
"I'm not disputing that they need to act quickly but one of the things that undermines this is the principle of community consent," Newcastle City Council leader Nick Forbes said.
"The sense that we're all collectively buying into these measures because we can see that they protect us all - is if there's a gap between what's announced in headlines and the details that people can understand.
"What that does is sow confusion, it creates doubt, it creates uncertainty."
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Households in the region had already been advised to avoid mixing but the new ban will be enforced with fines.
Gateshead Council leader Martin Gannon accepted the rules were "necessary" but said the authority had been "inundated" by people asking for details.
"It is a bit chaotic how these things happen," he said.
On Radio 4's Today programme Ms Keegan was unable to clarify whether the new restrictions stopped people meeting outside in pub and restaurant gardens, as well as inside.
She was pressed on how people were supposed to keep up to date with the latest restrictions when ministers could not and said: "I'm sorry I can't answer that question.
"I'm sure there are many people who could - I don't represent the North East.
"It'll be laid out and it will be clear to people in those areas, it will be communicated very clearly what they are."
The BBC has been told that mixing with other households in pub gardens or outdoor restaurant spaces in the North East is not being made illegal but goes against advice.
The new laws on household mixing send a strong message - even though there has been some initial confusion about exactly how they will be applied.
But questions are also naturally being asked whether these rules will be applied elsewhere. The North West has areas with higher rates of infection.
In the North East, only Newcastle is in the top 10 worst affected places currently, whereas several Greater Manchester and Merseyside areas feature.
The reason for this anomaly appears to be down to North East leaders being more enthusiastic for tougher measures.
Talks over the weekend between the government and officials in the region showed an appetite to go further.
Discussions are being held behind the scenes with North West officials. An announcement could come in the next few days.
Households in Newcastle, Northumberland, Gateshead, North Tyneside, South Tyneside, Sunderland and the County Durham council area had already been advised to avoid mixing but the new ban will be enforced with fines.
People aged over 18 taking part in an illegal gathering could be fined £200 for their first offence, which would be halved if paid within 14 days.
Second offences would incur a £400 fine, which would then double for each subsequent offence up to a maximum of £6,400.
Police had not been given "any notice whatsoever" that new restrictions were to be announced, Mr Forbes said.
Health Secretary Matt Hancock told the House of Commons on Monday that cases in the region had "risen sharply" and the rate of infections was now more than 100 cases per 100,000.
Data updated on Monday showed that for the week to 25 September Newcastle recorded 721 new cases of coronavirus - about 238 per 100,000 population - while South Tyneside had almost 197 cases per 100,000.
The lowest rate in the region was in Redcar and Cleveland with 55 cases per 100,000.
However, Mr Forbes criticised the health secretary for announcing the changes in Parliament "without telling us he was about to do so".
Stuart Henderson, a project manager from County Durham, said people were suffering "all because many 20-45 year olds are selfish and unable to take their civic responsibility seriously".
"We have already endured six months of lockdowns and restrictions, but now the only thing that was keeping me and my friends going - each other - is gone," he added.
"The government should find a way to target them, not punish us."
World Health Organization special envoy David Nabarro has warned against imposing stricter rules to control behaviour.
The "war" against this virus "is not going to be won by creating tougher and tougher rules", he told the Today programme.
"The only way that we will come out ahead of this virus is if we're all able to do the right thing in the right place at the right time because we choose to do it," he said.
The Department for Health and Social Care (DHSC) has been approached for comment and asked when the new rules will be published.
It has made clear informal childcare from family members, such as grandparents, will still be permitted but be on "an exclusive basis - always the same two households".