Fights
randomly started there between guards? Or did you start them yourself? I can't think of a place that has that sort of action. The closest I can think of would be Roxey Inn.
http://www.uesp.net/wiki/Oblivion:Roxey_Inn
There's a lot of NPCs that congregate in there, including at least one guard, maybe more than one. There's this weird cross-section of warriors there, too. And one invisible NPC, if I'm not mistaken. But I have never seen a spontaneous fight happen at the Roxey.
I will answer the Skyrim question in spoiler tags...so as not to possibly annoy the Oblivion regulars here, because this
is a Skyrim question.
Spoiler The Bee and Barb in Riften is probably the best Inn for a good mixture of NPCs. I mean, it is Skyrim, so you have to take what you can get so far as voicings go, but I have seen some spontaneous things happen there.
One NPC came after my character and challenged him to a public duel, right out of the blue, for instance.