There were 1,132 coronavirus-related breaches reported between 25 March and 7 April, the Manchester police force said.
That included 494 house parties – some with DJs, fireworks and bouncy castles – and 166 street parties.
Chief Constable Ian Hopkins said “each and every one of us need take this seriously”.
One woman in Bury became the first person in Greater Manchester to be charged under the Coronavirus Act 2020 after police had to repeatedly shut down one of the gatherings.
Greater Manchester Mayor Andy Burnham said such behaviour was “completely unacceptable” and is “putting everybody at risk”.