| O. Children | @ Hoxton Square Bar and Kitchen, London |
| Oakdale Middle School Car Boot Sale | @ Poole Adult Education Centre, Poole |
| OASIS tribute + Stone Roses show | @ Cox's Yard, Warwickshire |
| Objects Dart presents Tom Tit Tot | @ Woodend Barn Arts Centre, Banchory |
| Ocean/Linda Leiberman | @ Lucy Bell Fine Art, St Leonards on Sea |
| Octoberman | @ Monkey Chews, London |
| Octopussy | @ Liquid, Newcastle Upon Tyne |
| Odder's Mini Cine Picture Show | @ Bar Odder, Manchester |
| Odyssey | @ The Carriageworks, Leeds |
| Of Woman & Horse I have Known, Slip o... | @ Camden People's Theatre, London |
| Off Modern | @ Corsica Studios, London |
| Off the Charts | @ King William IV, London |
| Off the Endz | @ Royal Court Theatre, London |
| Off The Meters | @ Korsan, London |
| Off The Rails Comedy Club | @ The Royal George, Oldham |
| Official Receivers | @ Cox's Yard, Warwickshire |
| Official Receivers Soul Band | @ Cox's Yard, Warwickshire |
| Oh My God What The F**k, Groove Digge... | @ Babalou Bugbar, London |
| Oh Sleeper, Haste The Day | @ Cathouse, Glasgow |
| Oh So Sunday After Parties | @ Po Na Na, Brighton |
| Oh What A Lovely Recession Every Frid... | @ Peacock Bar, London |
| Oh What A Lovely War | @ Theatre Royal, York |
| Oh What A Lovely War | @ Belgrade Theatre, Coventry |
| Oh! What a Lovely War | @ Lyceum, Sheffield |
| Oi Polloi | @ Priory, Doncaster |
| Oklahoma | @ Leeds Grand Theatre, Leeds |
| Old Dollar Bill | @ Whiski, Edinburgh |
| Old School Reggae and R&B | @ Happy Peoples Restaurant, London |
| Old Skool Night | @ Hidden, London |
| Old Time & Modern Sequence Dancing | @ Morecambe Platform, Lancashire |
| Old Time Music Hall | @ Lauderdale House, London |
| Oldskool House, Ratpack, Merlin, Bill... | @ Babalou Bugbar, London |
| Oli Brown Band, Virgil & The Accelera... | @ The Duchess, North Yorkshire |
| Oliver | @ Phoenix Theatre, Northumberland |
| Oliver! | @ Palace Theatre, Worcs |
| Oliver! The Musical | @ Millennium Forum, Derry |
| Olivia The Musical | @ The Muni, Lancashire |
| Olney Farmers Market | @ Market Place, Bucks |
| Omar Souleyman | @ Scala, London |
| On A Level presents: Shimon | @ The Horn, Hertfordshire |
| On the mic - Open Mic | @ Southsid Bar, London |
| On the Permanence of Fugitive Colours | @ Hen and Chickens, London |
| On the Rocks | @ The Island Bar, Birmingham |
| On The Waterfront | @ Haymarket Theatre Royal, London |
| Once A Catholic | @ Brewhouse Arts Centre, Burton-on-Trent |
| Once in a Lifetime Tour 2010, Osmonds... | @ Wembley Arena, London |
| Once In A While | @ Excelsior Club, LONDON |
| Once Upon a Dance… | @ Oxford Playhouse, Oxford |
| Once Upon a Poem, Twice Upon a Tale | @ Poetry Cafe, London |
| Once Upon a Time at the Adelphi | @ Union Theatre, London |
| Once Viewed from Afar- Bristol | @ Centrespace Gallery, Bristol |
| 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 Good Reason, GreenOrange, Daydrea... | @ Tunnels, Scotland |
| One Man Lord of the Rings | @ South Holland Centre, Lincolnshire |
| ONE MIC..The Launch ft Babatunde, Jam... | @ Bernie Grant Centre, London |
| One Night In May | @ Minack Theatre, Cornwall |
| One Night In Vegas | @ Burnley Mechanics, Burnley |
| One Night Of Queen, Gary Mullen & The... | @ Sands Centre, Carlisle |
| One Night of Robbie | @ Burnley Mechanics, Burnley |
| One Night Only | @ Lamproom Theatre, South Yorkshire |
| One Night Stand Comedy Night | @ Cafe Artisan, Lancashire |
| One Night Stands | @ Blue Posts, London |
| Oneida | @ Freebutt, Brighton |
| OneTaste | @ Bedford, London |
| Onetaste@Takeover: Takeover Festival,... | @ Albany, London |
| Ono Palindromes | @ Barfly, Cardiff |
| Ooh La La!, Burlesque Night Circus La... | @ Bristol Bierkeller, Bristol |
| Opa Ćupa, London Gypsy Orchestra | @ Cecil Sharp House, LONDON |
| OPAL - international theatre directio... | @ Lugte, Basildon |
| Open Contemporary Dance Class for Pro... | @ The Place, London |
| Open daily | @ The Observatory Science Centre, Hailsham |
| Open Day | @ Dennis Severs' House, London |
| Open Day | @ Crescent Theatre, Birmingham |
| Open Days 2008 | @ Victoria Baths, Manchester |
| Open exhibition | @ JGallery, Northampton |
| Open Farm | @ Aldborough Hall Farm, Essex |
| Open House on Mothering Sunday | @ Weald & Downland Open Air Museum, West Sussex |
| 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 | @ Stumbles Inn, Somerset |
| 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 Session | @ Belushi's, London |
| Open mic' night | @ Duke of Connaught, Berkshire |
| Open Mic/ No Mic Rehearsal | @ The Railway Tavern, Colchester |
| Open Range | @ INDEPENDENT PHOTOGRAPHERS GALLERY, East Sussex |
| Open Salon 2010 | @ Viewfinder Photography Gallery, London |
| OpenArt | @ The Maltings Theatre and Arts Centre, Berwick-upon-Tweed |
| Opera Highlights, Essential Scottish ... | @ Heart of Hawick, Hawick |
| Opera Scenes | @ Bridewell Theatre, London |
| Operation Error, Special Guests | @ The Sugarmill, Stoke-on-Trent |
| Optic Saturday | @ Optic Club, Norwich |
| Oraclez, Bebe & Cece Winans, Donnie M... | @ Wembley Arena, London |
| Oral History | @ Booth Museum, East Sussex |
| Orchestra Cube: Open Rehearsal | @ The Cube, BRISTOL |
| Orchestra of Scottish Opera, Rory Mac... | @ St Andrew's in The Square, Lanarkshire |
| Orchids in the Glasshouse | @ RHS Garden Wisley, Surrey |
| Ordinary Days | @ Sir John Mills, Suffolk |
| 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 |
| Orkestra Del Sol | @ Oran Mor Glasgow, Glasgow |
| Orlando - Latin Live Music | @ La Rioja Restaurant, London |
| Orphaned Land | @ Underworld, London |
| Orpheus: A Concert for Spring | @ St Paul's Church, London |
| Orton Farmers Market | @ Orton Market Hall, Cumbria |
| Orvis Fly-Fishing Fair | @ Blenheim Palace, Oxfordshire |
| Osmosis | @ Rooty Fruity, Birmingham |
| Oswestry Farmers Market | @ Bailey Head, Shropshire |
| Othello | @ The Blue Elephant, Camberwell |
| Other Rooms presents, Chapel Club, pl... | @ The Other Rooms, Newcastle upon Tyne |
| Otley Farmers Market | @ The Market, Otley |
| Otters Swimming Club | @ Hayes Pool, Middlesex |
| Oundle Farmers Market | @ Market Place, Cambridgeshire |
| Oundle General Market | @ Market Place, Cambridgeshire |
| Our Lady of Sorrows | @ St James's Church, London |
| Our Lady of the Sorrows | @ St James's Church, London |
| Out & About Walks | @ Harrowbarrow and Metherell Village Hall, Callington |
| Out of Chaos - Temple Theatre | @ Pyramid and Parr Hall, Warrington |
| Out of Focus by Peter Gordon | @ Keighley Playhouse, Keighley |
| 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 |
| Outsider | @ Oriel Myrddin Gallery, Carmarthen |
| Over 55s group | @ Sydenham library, London |
| Over 60's Lunch Menu | @ Plough Inn, Leicestershire |
| Over The Moon | @ Favela Chic, London |
| Over The Moon | @ Wimbledon Studio, London |
| Over The Rainbow | @ Regis Centre, Bognor Regis, West Sussex. |
| Overdose | @ Po Na Na, Norwich |
| Ovum & Sci+Tec, Dubfire, Josh Wink, Y... | @ Matterley Bowl, Hampshire |
| Owen Pallett | @ KOKO, London |
| Owl City | @ Barrowland Ballroom, Glasgow |
| Oxfordshire Car Boot Sale | @ Didcot Football Club, Didcot |
| Oxfordshire Gang Show | @ New Theatre Oxford, Oxford |
| Oxjam: Live at the Roadhouse | @ Roadhouse, London |
