Exeter are into a fifth Premiership final in succession, while Wasps will seek revenge as they bid to end a 12-year drought.
Premiership Rugby confirmed Sale Sharks' match with Worcester Warriors had been cancelled amid a spate of coronavirus positives.
The Premiership is facing difficulties caused by the coronavirus pandemic and James Haskell has a suggestion to help it cope.
Sale Sharks can seal the final Premiership play-off place with a win after Saracens stormed back to deny Bath victory.
Positive COVID-19 tests at Sale Sharks will not prevent their crucial last game of the regular season from being played this weekend.
A bonus-point 40-3 victory over Leicester Tigers boosted Bristol's hopes of finishing in the Premiership's play-off places.
A dominant Sale Sharks performance was marred by an injury to Manu Tuilagi, while Northampton lost Courtney Lawes.
Chris Robshaw's last game at The Stoop ended in defeat for Harlequins as Wasps enhanced their chances of finishing in the top four.
A run of 28 unanswered points saw Bath boost their top-four hopes with a dramatic win over Gloucester.
A 1,000-strong crowd were allowed to watch Gloucester's Premiership defeat to Harlequins on Monday.