Cambridge is easily reached from London by train in under an hour.
However, if you are planning to stay in Cambridge the night before and/or after the meeting, accommodation can be booked through the Visit Cambridge website, which can be searched for wide range of bed and breakfasts, guest houses, hotels and self-catering accommodation.
The university Accommodation Service also has listings.
Trinity Hall offers accommodation at the main college site and at WYNG Gardens. For more details visit: www.trinhall.cam.ac.uk/conferences/accommodation/