Advice on running Open Space with 250-300 people

[aslak hellesoy]

Hi all,

I'm one of the organisers of a conference for agile software
development in Norway (http://smidig.no/smidig2007/talks).
It's two days and both days will have lots of 10 minute talks before
lunch (lightning talks) and OST after lunch.
We're expecting 250-300 people to attend, and I'm starting to get a
little overwhelmed about the OST sessions.
I have attended several smaller Open Space meetings, but never this
big, so I was hoping someone with experience of big OST meetings can
give some advice:

* Is 3 times 45 minutes topics (and 15 min break) ok?
* How many topics should we strive to create?
* How long should each participant get to suggest a topic?
* Should we split up the introduction/topic suggestion in two big groups?

My main worry is that with a big group like this it will be
challenging to create enough topics (and do it within a reasonable
time) so that people can put good use of the three hours they have
each day. I've read that OST has been used on much larger groups, but
I'm a little puzzled about the logistics.

Any help appreciated!

*
*
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