I have something to show at our monthly meetings at least 8 -10 times/year. Because sometimes there are people in the guild who end up judging at the fair, I wait with those items until after the fair. That means that my show and tell contributions bunch up a little.
We have excellent participation at show and tell, and I really enjoy seeing what others have made and getting ideas from them. For every entry a member brings, a ticket may be filled out. A drawing is done at the end of the year, and the winner wins a free membership for the next year.