Well, if anyone wants to get involved with a Linux demo day at the museum, we'd be happy to host. Last time I ran the demo just outside (we're in a pedestrian precinct).
Some photos:
http://www.flickr.com/photos/pramclub/5099792714/
http://www.flickr.com/photos/pramclub/5099792592/
http://www.flickr.com/photos/pramclub/5099792648/
http://www.flickr.com/photos/pramclub/5099792544/

Basically I just had my laptop running 10.10, some posters and some business-card sized cards with links to downloads.