Of course - I really enjoy these sorts of stories.

Here are some thoughts on entertaining and surprising events.

1. Upon entering the outer city the players encounter a group who ushers them to a hidden building, then attempts to hire them to overthrow Dispater.
2. Several city dwellers try to drive off the party, knowing their presence will bring nothing but suffering.
3. The players hear a loud crash and see a captive Gryphon has escaped, trailing blood it is turning towards its captors for a last stand.
4. A makeshift market is located, selling black market goods at 'too good to be true' prices, what's the catch?
5. The party is captured by Dispaters guards and forced to fight in the arena for the archdevil's amusement.
6. A small voice is heard coming from a storm drain, it's an urchin child, their mother is ill and needs the players to follow.

Of the above options, any could lead to unusual things to see and do. 

The urchin could lead to a forgotten underground city, smashed and buried in the haste to make Dis.
The black market could hold amazing items from foreign lands, one of which could teleport the party to a pocket dimension.
The infamous 'River of Blood' can be seen streaming from the tower gates, is it really blood? So much blood...

Let me know if any of those options sound interesting.
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