I am not sure how well that can be done and especially on a national level but a few companies are giving it a try in the upcoming
Referral Week. Not only does it include some heavyweights in the line-up but the sponsors are pretty outstanding. 
John Jantsch of Duct Tape Marketing is hosting the event, this is what he has to say: As the talk of recession crowds the news and economic stimulus package debates rage in Washington DC, it’s time for small businesses to take the matter into their own hands. Therefore we hereby declare March 9-13, 2009 – Make a Referral Week. Make a Referral Week is an entrepreneurial approach to stimulating the small business economy one referred business at a time.
The goal for the week is to generate 1000 referred leads to 1000 deserving small businesses. You can visit here to learn more
The cornerstone event during the week is a live web conference Tuesday March 10th at Noon CST. The event features Bill Cates, author of Get More Referrals Now!, Bob Burg, author of the Go-Giver, Ivan Misner, founder of BNI. A number of readers are using the event to get their their referral groups, networking groups, BNI groups, strategic partners, customers, MeetUps and business connections together to view the live web conference as a group.
This could be a great reason to bring folks together to learn and network.