Bristol Bears v Harlequins. English Premiership rugby match (Mens). Disclaimer: This is NOT the 2021 Semi-Final between Bristol and Harlequins, an exciting and unlikely playoff rugby match which extended into extra-time. March-2021.
Bris(tol) and (Harle-)Quins played two league names as per usual in that season/year, and then they faced off in the semi-final of course (so they played each other 3 times). Also, I see looking at the match fixtures-and-results that Bris only played London Irish once at that time, so maybe LondonIrish cancelled a fixture.
Source:
https://video.premiershiprugby.com/content/full-match-bristol-bears-v-harlequins-round-15
https://www.premiershiprugby.com/match-report/bristol-bears-35-33-harlequins#preview
https://www.bristolbearsrugby.com/news/report-bristol-bears-35-33-harlequins/