One of the things that is becoming common in the new world of new media is many companies are now publishing blog posts about their experiences at your convention of trade show. Many companies are now blogging and they have Facebook pages that they are using to publish articles about your convention, your trade show and event the meeting they attended. These articles, photos, and conversations can be re-purposed in recap posts.
Recap posts are feedback and review of attendee experience, exhibitor experience and sponsor experience. These can be some of the best advertising for your event as it is generally not a biased opinion of how well you did in your planning, or your organization of that event. You can also thank those that are writing about you by recognizing their blog post by putting it in a gathering of those posts in a single post on your own company blog.
Finally, by finding and listening to the content that is being generated, you can also get that valuable feedback that I discussed yesterday. Feedback and reviews written are great opportunities for find out what people that how you did. Publish they good bad and the indifferent and then follow that up with your own review and feedback of what you think went well and the things you intend improve on in the next event or show.