At some point when I have time, I’d like to read Cicero, On the Responses of the Haruspices 22-27 against Dionysius of Halicarnassus, 7.68. The former describes the disruption of the festival of Great Mother by Clodius, the latter a legendary event from the time of Coriolanus when a slave accidentally appeared to have led a procession in honor of Jupiter (Cf. Plutarch too).
The religious status or non status of slaves is interesting, as is it to think about what more recent events Dionysius may have been using as lens to understand the legendary past….