One idea would be to check out cuban expat blogs and forums, and look for cultural discussions (not political ones) and try to find people who will answer questions about music and such things in the pre-castro days.

People will be more likely to want to talk to you about their lives than about your writing and you can add and change things in your story based on things they tell you.

Another possibility is that there may be cuban faculty or students at a nearby university who you can hang out with. Also, you might have a drumming group around, and they might be connected to religious celebrations, etc. I know that Santaria rituals are done in a lot of expat communities as a way of keeping in touch with the culture.