UPDATE: You can find more up to date info in this post.
Lewisham Council has posted some notes about the big screen planned for Blackheath during the Olympics. Amongst other things:
The greatest show on earth – live on Blackheath
As well as being great fun, events taking place at the site will be designed to encourage communities to participate in improving their health and well being, become involved in their local community and celebrate local achievements. The Community Live Site will provide a showcase and fundraising opportunities for local voluntary and charitable organisations.
In addition to the big screen, another great attraction at the Live Site will be a beautifully decorative and rare Spiegel Tent which will play host to a range of events for all ages including tea dances, cinema, storytelling and live music. This splendid venue is so glamorous it is worth a visit in itself, even if it is to take in the surroundings, have a bite to eat or enjoy a cocktail created especially for the event.
It’s not that rare… I’m suspecting the Spiegel Tent will be the same one that featured at the Hyde Park winter wonderland. I went to this, and it was an overpriced restaurant & bar in a setting that looked like a leftover from the Moulin Rouge. Quite fun, and it had good Gluvine, but I seem to remember 3 drinks costing the best part of £15.
Licensed under a 
The Blackheath Bugle 