I belong to a big guild. We used to take signups before the meeting but folks would forget. Instead we just line up and sign up. Then have someone hold the quilt as we give a short blurb about the quilt - who it is for, what inspired us to make it. Then we walk over to the other side of the room and get our photo taken with our quilt. The photo gets posted without identification on our website so we can take a copy if we forgot to take a photo at home of our work.
At the end of show and tell, everyone who did sign up has their name drawn for 1 chance at a gift certificate/door prize from one of our affiliate member stores (value between $5 and $30 dollars).
We can go through about 30 - 40 members with show and tell of multiple quilts per member in about 30 minutes. The process works pretty well and gives us enough detail info so we can go online and search that month's meeting show and tell photos to look at the quilt enlarged on our computer screen to see some of the overall detail of the quilt (but nothing close up). Many members do stick around after the meeting and are happy to show off the finer detail in their quilts up close if you ask them to do so.