Sure, we work with a local brewery around the time of our major anniversaries. (e.g. 25th, 30th, 35th.. soon 40th, eep) and other times as well. We set a style of beer ahead of time (determined in conjunction with the brewery) and give everyone a fixed period of time in which to brew an example.
Then we'll have a tasteoff at one of our monthly meetings. Entrants hand their beers off to a set of organizers who will randomize and pour each sample into pitchers. The beer is poured for everyone at the meeting and notes are taken, comments are made. After each beer is tasted, the membership votes for their favorite: (i.e. #9 got 10 votes, #20 got 15 votes and is the winner).
We'll then take the winner, give them a parade and take their recipe to the brewery for tweaks. The club will then gather up at the brewery and have a brew day to make a 7-10 barrel batch of brew that goes on tap around the town.