Brits who celebrate Christmas with their family could be forced to self-isolate for two weeks afterwards.
Government scientists say it could stop the spread of coronavirus during the festive season.
Newly released documents from Sage also suggest moving the traditional holiday to summer which sparked ridicule on social media.
The paper says the public should be given more advice on how to manage their risk when they're meeting more people than usual.
It comes days after England was plunged into a second national lockdown which bans people from meeting friends and family if they don't already live with them.
Scientists have suggested that "planning a summer family get together could replace meeting at Christmas".
Now, officials say that if social gatherings do go ahead, people should be given advice on how to cut the risks of passing on the virus – including by staying at home for weeks afterwards.
The paper says: "After a period of high exposure to multiple contacts of different networks – eg a social gathering – the risk of spreading an infection to other people can be reduced by avoiding contact as far as possible for two weeks."
Boris Johnson has repeatedly vowed to give Brits "as normal a Christmas as possible" after the current shutdown in England comes to an end in December, the Sun reports.
Now papers released by Sage suggest an "extensive education campaign" warning people of the dangers of mixing with others will be launched.
Last week, Cabinet minister George Eustice said that gatherings on December 25 could be broken up even if fewer than six people are present.
And Sage adviser Professor Susan Michie said the Government must plan ahead for festive rule-breaking.
"It seems to me that the social contract with the Government over following the rules is likely to break down over Christmas," she said.
"This would be very detrimental to getting out of the pandemic.
"So I think it is worth the Government considering a very different approach to Christmas, which is not based on rules."
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