This year we will provide possibilities for doing workshops in a more open way: They are located in the workshop area in the hackcenter – no more in a conference room. You can easily submit your demonstration, discussion or brainstorming on the workshop area page at the 22C3 Wiki. There are still up to 25 hours left – especially on the first and last day.
The workshop area offers a good opportunity for getting deeper into topics, which were mentioned in a Lightning Talk – presumed that the lighting-talker has reserved a hour or two in the workshop area.
If you need a bit server space with HTTP and FTP access for hosting your project material, you can be happy with the hosting offer by Dirk. Your content will be located in Houston.