Study trip to Brazil

I work for a small non-profit, Bahia Street, that works to educate young girls in Salvador, Bahia, Brazil. For the fourth year, we have put together a study trip to Brazil that allows participants to learn about issues of equality, race, culture, and society in general. I am wondering if anyone has suggestions for how to find a good group of participants (about 10) for this trip? The first three trips were made up of friends and friends-of-friends, but now it's time to offer it to a larger group of people.

Here's the page with the trip info:

thanks for any suggestions!

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