I always wanted to run a mystery adventure set around the Battle of the Bands!
Basically, the party includes a Bard (can be NPC if no players volunteer), and they are all travelling to a large caravan city for a huge bardic competition...and of course the parties Bard wants to compete.
Basically, the group learns early on that judges are on the take, there is mystery and underhandedness afoot, the guards are "looking the other way" ... and the competition is tough.
There are several ways to go with this...they can jump into the underhandedness with both feet...bribing, threatening, kidnapping, etc.
Or they can try to keep it honest.
Also, make sure you throw in rumors and innuendo about the "prize" ... (which of course turns out to be Bragging Rights - substantial ones, being that this is a once a decade competition).
This just always struck me as a great city adventure. Lots of fun...heck, if the party wants, you could even throw together a party of rogues/bards and the like...and have them all involved as a band.
Cedric