Hiya Cheshire Kate!
The North West is going to be very well off for things in 2009!
The Eccles playdays/concerts are designed primarily for orchestral instruments, so if you play anything in the string/woodwind/brass/percussion families, at grade 2 or higher, you'll be most welcome. Next one is due to be in late winter/early spring, date to be announced shortly.

There's also the Stalybridge Adult Learners' concert, provisionally booked for Saturday 18th July, where I'm sure sbhoa will appreciate another accompanist on board, and of course you'd be most welcome to perform a piece, either solo or in conjunction with others. Sbhoa is your main contact for this event.
There's also a forum concert happening in Chester on Saturday 19th September, which pianocrazy is organising, and I'll be handling a lot of the musical side. Again, as with Stalybridge, you'll be most welcome to do a solo/ensemble piece, and if you can make it, it'd be wonderful to be able to use your services as an accompanist.

Hope to see you at an event in 2009, and all the best for your grade 8 result.