| O Miei Giorni by Jacopo Peri, Transit... | @ Wiltons Music Hall, London |
| O'Hooley & Tidow | @ The Boardwalk, Sheffield |
| Oakdale Middle School Car Boot Sale | @ Poole Adult Education Centre, Poole |
| OASIS Tribute Definitely Mightbe, Sto... | @ Cox's Yard, Warwickshire |
| Oasist | @ The Horn, Hertfordshire |
| Obsession pres Jakki Degg | @ The Venue, Dumfries |
| Occasionally Ovid | @ Etcetera Theatre, London |
| Oceansize | @ Concorde 2, Brighton |
| Oceansize, Special Guests | @ The Sugarmill, Stoke-on-Trent |
| Ockham's Razor - The Mill | @ Brighton Dome, Brighton |
| Ockham's Razor THE MILL | @ Dream Factory, Warwick |
| Ockham's Razor-The Mill | @ Brighton Dome, Brighton |
| Octopussy | @ Liquid, Newcastle Upon Tyne |
| Odd collective | @ Odd Bar, Manchester |
| Odder's Mini Cine Picture Show | @ Odder Bar, Manchester |
| Oddest collective | @ Oddest Bar, Manchester |
| ODi | @ Verve, Leeds |
| Of Mice And Men | @ Broadway Theatre, London |
| Of Montreal | @ KOKO, London |
| Off Modern | @ Corsica Studios, London |
| Off The Meters | @ Korsan, London |
| Off The Rails Comedy Club | @ The Royal George, Oldham |
| Off The Wall | @ The Muni, Lancashire |
| Off With Their Heads | @ Underworld, London |
| Official Receivers | @ Cox's Yard, Warwickshire |
| Official Receivers | @ Artrix, Bromsgrove |
| Oh So Sunday After Parties | @ Po Na Na, Brighton |
| Oh What A Lovely Recession Every Frid... | @ Peacock Bar, London |
| Oi Polloi | @ Priory, Doncaster |
| Oklahoma | @ Edinburgh Playhouse, Edinburgh |
| Old Dollar Bill | @ Whiski, Edinburgh |
| Old School Reggae and R&B | @ Happy Peoples Restaurant, London |
| Old Time & Modern Sequence Dancing | @ Morecambe Platform, Lancashire |
| Old Time Music Hall | @ Lauderdale House, London |
| Oleanna | @ Theatre Royal, York |
| Oliver | @ Tamworth Assembly Rooms, Staffordshire |
| Oliver! | @ Theatre Royal, London |
| Olney Farmers Market | @ Market Place, Bucks |
| Olof Arnalds | @ The Bush Hall, London |
| Olympians | @ Norwich Arts Centre, Norwich |
| OMG! Fridays @ Berties, Berties Night... | @ Berties, Midlothian |
| On Overgrown Paths | @ Impressions Gallery, Bradford |
| On the mic - Open Mic | @ Southsid Bar, London |
| On The Razzle | @ Minack Theatre, Cornwall |
| On The Real @ Plan B with DJ Rhettmat... | @ Plan B, London |
| On The Real with Skandal, Jimmy Scree... | @ Plan B, London |
| On The Real: Skitz Sticksman Album La... | @ Plan B, London |
| On the Rocks | @ The Island Bar, Birmingham |
| On The Waterfront | @ Haymarket Theatre Royal, London |
| Once In A While | @ Excelsior Club, LONDON |
| Once Upon a Poem, Twice Upon a Tale | @ Poetry Cafe, London |
| Once Upon a Sketch | @ Camden Head, London |
| Once Upon a Thames, Story of the Lond... | @ The Basement, London |
| Once Upon A Time | @ Trinity Theatre, Tunbridge Wells |
| One Big Night Out | @ Pure Newquay, Newquay |
| One Flea Spare | @ Theatre Royal, York |
| One Fly-over & A Cuckoo's Nest | @ Inn on the Green, London |
| One Foot Cow | @ The Last Days of Decadence, London |
| ONE FOR THE ROAD with DJs | @ Roadhouse, Manchester |
| One Man Lord of the Rings | @ Sands Centre, Carlisle |
| One Man Lord of The Rings | @ Millennium Forum, County Londonderry |
| One Man Lord of the Rings | @ Lyceum, Sheffield |
| ONE MIC..The Launch ft Babatunde, Jam... | @ Bernie Grant Centre, London |
| One Night In November | @ Belgrade Theatre, Coventry |
| One Night In Vegas | @ Elgiva Theatre, Chesham |
| One Night Of Elvis | @ Elgiva Theatre, Chesham |
| One Night Of Queen | @ Cresset, Peterborough |
| One Night of Queen | @ Leeds Grand Theatre, Leeds |
| One Night of Queen | @ New Theatre Oxford, Oxford |
| One Night Of Queen, Gary Mullen & The... | @ Sands Centre, Carlisle |
| One Night of Robbie Williams | @ New Theatre Oxford, Oxford |
| One Night Only | @ Heaven, London |
| One Night Stand Comedy Night | @ Cafe Artisan, Lancashire |
| One Night Stands | @ Blue Posts, London |
| OneTaste | @ Bedford, London |
| Ook and the Terrible Thing That Happened | @ The New Diorama Theatre, London |
| Open Contemporary Dance Class for Pro... | @ The Place, London |
| Open daily | @ The Observatory Science Centre, Hailsham |
| Open Day | @ Dennis Severs' House, London |
| Open Days 2008 | @ Victoria Baths, Manchester |
| Open exhibition | @ JGallery, Northampton |
| Open Farm | @ Aldborough Hall Farm, Essex |
| Open House London | @ Danson House, Bexleyheath |
| Open House London | @ Hall Place and Gardens, Bexley |
| Open Meditation Class (Tuesday evening) | @ London Buddhist Centre, London |
| Open Meditation Class (Wednesday even... | @ London Buddhist Centre, London |
| Open Mic | @ The Ram Jam Club, Surrey |
| Open Mic | @ The Barge, Gillingham |
| Open Mic Acoustic Night | @ Finnegan's Wake, London |
| Open Mic and Spoken Word | @ The Half Moon, London |
| Open Mic hosted by LUSH | @ LadyBird, London |
| Open Mic Night | @ Locomotive Inn, North Yorkshire |
| Open Mic Night | @ Comedy Cafe, London |
| Open Mic Night | @ Southern K, London |
| Open Mic Night | @ River Bar and Brasserie, London |
| Open Mic Night | @ Elgins, Cleveland |
| Open Mic Night | @ Yates's, Newport |
| Open Mic Night | @ Spice of Life, London |
| Open Mic Night | @ Balgonie Arms Pub, Glenrothes |
| Open Mic Night | @ Belushi's Fulham, London |
| Open Mic Night | @ The Maltings Theatre and Arts Centre, Berwick-upon-Tweed |
| Open Mic Night | @ The Crown Inn, Chislehurst |
| Open Mic Night | @ Betty Nicols, Fife |
| Open mic night | @ The Carnival, North Lincolnshire |
| Open Mic Night | @ The Continental, Preston |
| Open Mic Night | @ The Counting House, Plymouth |
| Open Mic Night | @ The Lansdowne Bar & Kitchen, Glasgow |
| Open Mic Night | @ The Continental, Preston |
| Open Mic Session | @ Belushi's, London |
| Open mic' night | @ Duke of Connaught, Berkshire |
| Open Mic, Guest hosts from the Scotti... | @ The Doghouse, Angus |
| Open Mic/ No Mic Rehearsal | @ The Railway Tavern, Colchester |
| Open Range | @ INDEPENDENT PHOTOGRAPHERS GALLERY, East Sussex |
| Open to Fire, Daddy Delux, Hoodoo Fif... | @ The Actress and Bishop, Birmingham |
| OpenArt | @ The Maltings Theatre and Arts Centre, Berwick-upon-Tweed |
| Opening weekend | @ The Sands Blackpool, Blackpool, Lancashire |
| Ophelia Must Die | @ The Lion and Unicorn, London |
| Opium: The Confessions of Thomas De Q... | @ Hare & Hounds, Birmingham |
| Opposite Sex | @ Rhodes Arts Complex & Bishop's Stortford Museum, Hertfordshire |
| Optic Saturday | @ Optic Club, Norwich |
| Oral History | @ Booth Museum, East Sussex |
| Orange Goblin, Solace, Firebird | @ Talking Heads, Southampton |
| Orchestra Cube: Open Rehearsal | @ The Cube, BRISTOL |
| Orchestra of the Age of Enlightenment... | @ Wiltons Music Hall, London |
| ORCHESTRE POLY-RYTHMO DE COTONOU | @ KOKO, London |
| Organ Recital on Tuesdays | @ St Mary's Church, Melton Mowbray |
| Organ Recitals | @ Westminster Abbey, London |
| Organ Recitals at Lunchtime | @ St Mary's Church, Melton Mowbray |
| Original Tea Dance | @ BJ's White Swan, London |
| Orlando - Latin Live Music | @ La Rioja Restaurant, London |
| Orton Farmers Market | @ Orton Market Hall, Cumbria |
| Osmosis | @ Rooty Fruity, Birmingham |
| Oswestry Farmers Market | @ Bailey Head, Shropshire |
| Othello | @ Lauderdale House, London |
| Othello | @ Space, London |
| Othello By William Shakespeare | @ Lauderdale House, London |
| Otley Farmers Market | @ The Market, Otley |
| Otters Swimming Club | @ Hayes Pool, Middlesex |
| Ou Est Le Swimming Pool | @ Barfly, London |
| Ou Est Le Swimming Pool, Special Guests | @ The Other Rooms, Newcastle upon Tyne |
| Oundle Farmers Market | @ Market Place, Cambridgeshire |
| Oundle General Market | @ Market Place, Cambridgeshire |
| Our Country's Good | @ Lincoln Drill Hall, Lincoln |
| Our House | @ Watford Palace, Watford |
| Our House | @ South Holland Centre, Lincolnshire |
| Our Share of Tomorrow | @ Pleasance Courtyard, Edinburgh |
| Our Share of Tomorrow | @ Theatre Royal, York |
| Out & About Walks | @ Harrowbarrow and Metherell Village Hall, Callington |
| Out of Sight | @ Barfly, London |
| Outdoor Antiques Market | @ Market Place, Northamptonshire |
| Outdoor Flea Market | @ Chesterfield Market, Chesterfield |
| Outdoor Flea Market | @ Piece Hall, Halifax |
| Outdoor Fleamarket | @ Market Place, Nottinghamshire |
| Outdoor Fleamarket | @ Bulwell Market Place, Nottingham |
| Outdoor Fleamarket | @ Market Place, Hertfordshire |
| Outdoor Fleamarket Market | @ Market Place, Nottinghamshire |
| Outdoor Market | @ Gorton Market, Gorton |
| Outside The Box | @ The Fighting Cocks, Surrey |
| Over 55s group | @ Sydenham library, London |
| Over 60's Lunch Menu | @ Plough Inn, Leicestershire |
| Over The Moon | @ Favela Chic, London |
| Overdose | @ Po Na Na, Norwich |
| Oxfordshire Car Boot Sale | @ Didcot Football Club, Didcot |
| Oxjam | @ ACE Centre, Nelson |
| Oxjam at The Coronet, Faithless Sound... | @ The Coronet Theatre, London |
| Oxjam presents: The Evil Beat | @ The Cooler, Bristol |
| Oxjam: Live at the Roadhouse | @ Roadhouse, London |
| Oxygen | @ Oxygen club, Barnsley |
| Ozric Tentacles | @ Mr Kyps, Poole |
| OZZFEST, Ozzy Osbourne, Korn, Murderd... | @ The 02 Arena, London |
