An 84-year-old man was among those hurt during the incident at St Paul's Cray hall, in Orpington, south-east London, on Tuesday night.
"None of the injuries are believed to be serious and none were caused by the machete," a Met Police spokesman said.
The force said a man, 56, had been arrested as part of investigations.
He was arrested on suspicion of assault and criminal damage and was being treated in hospital for a hand injury, the police spokesman added.
'Smashed car'
Members of the group said a masked man with a Mohican haircut, or wearing a wig, broke into the hall and staged a random attack.
Two women, one in her 80s and another aged about 60, and three men - one aged 84 and two in their 60s - were injured, according to the Met.
Ginny Warner, who had been singing in her local ladies' barbershop group, said a man "went to the vicar's driveway and was smashing up the vicar's car and then he started walking towards where we were".
"I was trying to peep through the curtains to describe him to the police on the phone without being noticed," she added.
Ms Warner said it took two passing strangers to bring the attack to a halt.
"A black guy who was a complete hero arrived and wrestled the guy on to the grass," she said.
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