British Boxer Club holds it's open shows at Steventon village hall (it's last one was in March)
When this hall in unavailable they use Drayton village hall.
http://draytonvh.org.ukSteventon have small areas around the main hall floor for caging but it's not vast.
Don't know what breed you have but the Boxer cages fill these area's pdq and isn't enough for all that perhaps
would like to cage indoors. Although if you have small dogs you may get away with also using the stage area.
It has a kitchen that you can use and a seating area.
The bonus for Steventon is it's not far from the A34.
The recreation field is used by people that play football and walk their dogs. Not sure if hiring the hall gives you
any use of the recreation field to the side of the hall. Parking is reasonable and all tarmac'd.
I do know Bradfield Village hall in Berkshire (Not far from the Theale junction off the M4) is used for doggy events
See here for charges
http://www.bradfield-parish.co.uk/villagehall.htmlLooking at it, if you wanted the hall and fields it would be £115 for the day.
It's a nice venue outside - although I've not been there for yonks and can't remember what the hall is like.
The Parish have their MayFayre at the same venue this weekend.
Another in Oxfordshire that I know is used for exemption shows and Oxford DCS for it's limit show is
Horspath village hall Nr Oxford
http://www.horspath.org.uk/villagehall/It does allow the hirer to use some of the recreation ground but you need to double check which areas you
are allowed to use.