James and Oliver Phelps (Fred and George Weasley) will be attending the Thames Festival in London, England this weekend, where they will be showing behind-the-scenes footage from one (or more) of the Harry Potter films (it is unknown whether or not it will contain new scenes from Half-Blood Prince).

The event takes place from September 13-14 in the Jubilee Gardens near the London Eye, which is open to the public.

If anybody does go, please feel free to send a report/pictures/video in to us!