The glorious, splendidly silly comic duo that is Lip Service play Holmes and Watson investigating a series of music-hall murders involving Vesta Curry and her Novelty Pipe-Smoking Act and Death-Defying Dan and His Whelk-Infested Tank of Terror.
Ends tonight, Leicester Haymarket (0116 253 9797)
East is East
The welcome return of Ayub Khan-Din's fresh, fast, smash-hit comedy in which family tensions erupt at home and in the chip shop. Crackling dialogue delivered by a rambunctious cast led by the indomitable Linda Bassett. A real treat.
Theatre Royal Stratford East (0181-534 0310)
The Birthday Party
Doreen Mantle, the glorious Mrs Warbuoys from TV's One Foot in the Grave, returns to the stage to lead a strong cast in Andy Farrell's excellent revival of Harold Pinter's hilarious and horrifying early play about mysterious visitors invading a seaside home.
Dancehouse, Manchester (0161-274 4400)
The Comedy of Errors
"Twins in Nightmare Baby Swap Shock!" Unlike those Shakespeare comedy productions full of crass crotch-grabbing to underline the jokes, or those stultifyingly unfunny "intelligent rethinks", Tim Supple's outstanding RSC small-scale production is chock full of insight and brazenly hilarious with it.
Great Sankey Leisure Centre, Warrington (01925 634958) tonight
Lux Park Leisure Centre, Liskeard (01579 344415) from Tue
Guys and Dolls
One of the greatest musicals ever written in Richard Eyre's first-class production, with cracking performances and a glorious neon-filled set. The result? Unconfined joyousness. Go, if only to experience the waves of pleasure flooding from stage to auditorium and back again.
National Theatre, London SE1 (0171-928 2252)
Selling out and it's not even press night, but then what do you expect with Chekhov in the hands of Jonathan Kent and David Hare with Ralph Fiennes, Harriet Walter, Bill Paterson and the like in the cast? Fortunately, day seats are available.
Almeida Theatre, London N1 (0171-359 4404)
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