But there is plenty of digital evidence it really happened!
Check out the #CISB hashtag on Twitter, the CISB'09 room on FriendFeed, and the blog posts:
Cromer Is SO Bracing '09 - Day One
Cromer Is SO Bracing '09 - Day Two
Cromer is SO Bracing - Friday Lunchtime update
Cromer Is SO Bracing - Pier Review
Cromer is SO Bracing - Saturday Afternoon
Cromer is SO Bracing - Sunday
Sorry to have missed this, but my ghost that "slept on that sofa" was there!