Footage circulated on social media last year appears to show dozens of unmasked Charedi wedding guests in close contact at an indoor venue.
The London-based Negina Choir shared several clips of the event on Instagram in late October, including one in which guests can be seen holding hands.
The choir said in the caption to a post published on 21 October that the gathering was a "beautiful wedding with the great Shmueli Ungar together with the talented Yitzchok Ginsberg.”
Haze Event Lighting, one of several businesses tagged, told the JC it was not present at the event and did not know when and where it took place. The company also said it offers the “option of dry hire where customers can rent uplighters for their own use.”
Mr Ungar, a singer based in Brooklyn, New York, also shared clips of what appears to be the same event, saying “London was amazing”, tagging Mr Ginsberg and the Negina Choir in his post - also published on October 21.
#London was amazing! Check out the energy from these Bucherim at a wedding with yitzchok ginsberg & the Negina Choir pic.twitter.com/U6XP8X43QN
— Shmueli Ungar (@ShmueliUngar) October 21, 2020
Later that month, the US-based performer shared footage of another performance - in New Jersey.
Under England-wide lockdown rules, weddings and receptions were restricted to a maximum of 15 people from September 22.
The Negina Choir were approached for comment.