Sometimes having a single Cameo by a star or other famous person just isn't enough, so creators will have multiple stars make cameos. After all, if one cameo is good, a bunch of them should be even better!
Often, they will be heavily advertised to attract as many audience members as possible. Conversely, they may be kept secret to surprise the audience and generate buzz after. When done well, it can be awesome to see so many stars popping up in a favorite work. Done poorly, however, they can overshadow it.
Tropes Are Flexible, but a good rule to follow is that the work in question should have at least three cameos in the same segment or episode to qualify.
Sub-trope of The Cameo and may cross over with any of the other sub-tropes there. Compare Special Guest and Celebrity Star which may also apply. Similar to, but not to be confused with Continuity Cavalcade, which is instead a series of Continuity Nods in quick succession. Compare Crossover.
Naturally, this trope is ubiquitous in Fan Works, particularly Crossovers. Since these (typically) don't involve the real person/character (or their voice, or an official representation of them), they should not be listed here.
Cameo Cluster has been suggested to play 2 roles. Click below to see other actors suggested for each role, and vote for who you think would play the role best.