Hi Val,
my name is Raman Im an addict.
Im from the Bangalore area , in the India region of the Asia Pacific Forum.

We have had many conventions and unity days here.

For themes and topic specifics the Basic Text is full of clues. We usually use that or the It works how and Why.
Then members themselves can propose themes and if that fits in with the Recovery Program Concepts, than thats good too.

But that said, any NA approved literature is a valid source; best of luck to you and your area !