What are a stag's comrades called?
Solution 1:
Can't find anything other than male friends or men:
stag party |støg ˈpɑrdi|
noun
a celebration held for a man shortly before his wedding, attended by his male friends only.
• any party attended by men only.
NOAD
Edit:
Well, now, hold on. This (from an 1897 slang dictionary) might be getting us somewhere:
If there's anything to this etymology, then it's quite clear that the other stag partygoers are the feeble fools of the herd.
Solution 2:
A (new ?) humorous usage via the movie "The Hangover" is the wolfpack.