The Windows Project
Windows is a registered charity that works with poets to get them working with children and young people. Last year they arranged over 1,000 workshops in schools and in the wider community (e.g. through libraries, playschemes, community centres). They are based in offices on Bold Street, Liverpool, above the News From Nowhere bookshop.

www.windowsproject.demon.co.uk

 
Commonword
Commonword are a Manchester based organisation that promote the writing and publication of work by 'outsiders'. For example, Black and Asian voices (Cultureword), queer voices, and the voices of those with disabilities. They run both writers' groups and a publishing imprint Crocus.

www.commonword.org.uk

Write Out Loud
A Bolton-based organisation offering a chance to read your own poems in a warm, supportive environment at The Howcroft Inn on the 3rd Sunday of each month. Check out their website for details of this, and other events organised by them. The site also has a comprehensive national gig guide and and area for you to post your profile and a couple of poems

www.writeoutloud.net

The Poetry Society
The Poetry Society is probably the biggest and best-funded poetry society in the UK, so whilst it is fairly London-centric, it has got some useful stuff on its site

www.poetrysociety.org.uk

(check out Education for writing exercises to tempt a sleeping muse)