In reply to Philip:
Thanks for the replies so far. I've never had any involvement with student placements so have very little idea who initiates any arrangement or how. In our case there really isn't any concept of 'local' since the events are based in the south of France but for English-speaking clients so British students living out here for the summer would be best, and we'd find accommodation with us here. By the same token there's no local Chamber either.
I suppose what I'm hoping for is some indication of which institutions (if any) are likely to be interested in this, and (ideally) who to contact to discuss it.