Police are investigating 12 parties in Downing Street and Whitehall, including a birthday gathering for Boris Johnson, according to Sue Gray's report.
The top civil servant revealed she was looking at 16 events in her partygate probe - and 12 of those are being examined by the Metropolitan Police.
Ms Gray said it was "not possible at present to provide a meaningful report" setting out all she discovered, due to the ongoing police investigation.
Her report can only give the details of four of the alleged events in Downing Street as the other 12 are under investigation for possible criminal behaviour.
A limited version of the report into No 10 and Whitehall parties during lockdown has criticised a “serious failure” to observe the high standards expected of those working at the heart of Government.
Sue Gray’s findings were published online as Boris Johnson prepared to face MPs at 3.30pm as he fights to save his premiership.
Sue Gray said she decided not to publish factual accounts relating to events not under investigation by police because it would damage her overall findings.
She wrote: “In respect of the gatherings that the Metropolitan Police has assessed as not reaching the threshold for criminal investigation, they have not requested any limitations be placed on the description of those events, however, I have decided not to publish factual accounts in relation to those four dates.
“I do not feel that I am able to do so without detriment to the overall balance of the findings.”
The events originally under investigation by Sue Gray are
But Sue Gray said the only events she was able to investigate - those not being probed by police - are
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