The point is, immediacy isn't always the best fit for your audience. In fact, a double whammy of at-show and post-show communication is probably best to ensure that you're reaching both types of attendees, i.e., those that demand immediate attention, and those that prefer more delayed gratification.

So send customers and prospects an email during or immediately following the show. But then wait until the week after the show, when attendees have sufficiently settled back into their offices and cleaned out their email inboxes, to send (or resend) your communication. While the double-whammy system will likely take a bit more time and effort on your part than a single follow-up missive, you'll likely get double the results.