The Metropolitan Police has launched a new investigation into alleged breaches of Covid laws at Downing Street, Chequers, inside parliament and the Conservative Party headquarters.
The probe includes more gatherings attended by Boris Johnson while he was prime minister, and a Christmas party where Tory staffers were invited to "jingle and mingle".
Scotland Yard announced that it was "assessing information and new material" over events in 2020 and 2021 on Monday, which is Mr Johnson's birthday.
Its previous Partygate investigation saw 83 people, including the former prime minister and his successor Rishi Sunak, given a total of 126 fines.
A Metropolitan Police spokesperson said: "A number of other events have subsequently been referred to us which we are in the process of assessing."
The announcement came hours before MPs were due to debate a report finding Mr Johnson had misled parliament over Covid breaches, which would have seen him suspended from parliament had he not resigned.
Police are assessing material passed by the Cabinet Office "regarding potential breaches of the regulations between June 2020 and May 2021 at Downing Street and Chequers".
The evidence is understood to have come from official diary entries that were being reviewed ahead of the Covid public inquiry, and were passed to police in May in a move attacked by Mr Johnson's allies.
At the time, a statement from the former prime minister's office said his lawyers had written to police to "explain in detail why the Cabinet Office is entirely wrong in its assertions".
The Metropolitan Police said it was also assessing media reporting of "alleged breaches in parliament" and looking at previously unseen footage of a Christmas gathering at the Conservative Party's campaign headquarters on 14 December 2020.
A video published by The Mirror showed staff dancing and joking about Covid restrictions, which one attendee heard saying: "As long as we don't stream that we're, like, bending the rules."
A dancing man and woman crashed into a buffet table stacked with food and wine glasses at one point, while other guests walk past wearing paper crowns and clutching alcoholic drinks.
An invitation to the event obtained by BBC News read: "JINGLE AND MINGLE: Save the date - Monday December 14th at 6pm for the Shaun Bailey for London holiday party."
Scotland Yard initially launched an investigation after the Daily Mirror published a picture of the gathering, but concluded that the photo by itself was not sufficient evidence to find an offence had been committed.
CCHQ said "formal disciplinary action" was taken against four staff members, who were seconded to the London mayoral campaign of Mr Bailey, over the "unauthorised" event.
The failed candidate - who was handed a peerage by Mr Johnson in his controversial resignation honours list - has previously apologised for the event. Tory aide Ben Mallet , who was awarded an OBE on the list, is also visible in the video.
A spokesperson for the Metropolitan Police said: "Our approach to the assessment of these allegations has been consistent throughout, enforcing the law carefully, thoroughly, proportionately, impartially and without fear or favour.
"We have previously published our criteria for assessing when to launch investigations into retrospective breaches of the regulations.
"We will do so when there is evidence of a serious and flagrant breach and where it is proportionate and there was evidence that those involved knew or ought to have known what they were doing was an offence."
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