Hi Dave -

As an accordionist I play a few polkas, although I really don't like to!

Here are some I play often:

Beer Barrel Polka
Clarinet Polka
Helena Polka
Liechenstiener Polka
La Campognola
Tick Tock Polka

Wow, I think I play a lot more than that but those are the only ones that come to mind quickly. I really wish I had the sheet music to fax you (eFax even) but I learned them when younger and they have been committed to memory for years as the actual sheet music decomposes (joke intended) in my parents musty basement 500 miles away.

Good luck with your gig!

Tommy