We usually do flights of 3 beers. Each person gets 3 - 9 oz. plastic cups, numbers them with a marker to keep everyone on the same beer, then the brewer discusses their beer. Sometimes we allow commercial beer as a reality check. The homebrews win that contest most of the time.
I have made numbered identifying collars out of PVC pipe that fit around the neck of the bottle to keep the #1 beer in the #1 cup, and so on, as the bottles are passed around the table. Things get confusing after 3 flights, even at 2 ounce samples!
At the beginning of the meeting, everyone who brought something fills out a 3"x5" card with their name, beer name and exact type and whether its homebrewed or commercial. Beers that match the style of the month, say IPAs, are sorted according to the strength and complexity before the tasting begins, then the person running the meeting calls out the persons name and their beer name, a collar is put on the open bottle and passed around. Then the fun begins.