Two routes that could prove to be lucrative sources for this type of trip would be business sponsorship and support from a religious institution. Many business are willing to donate philanthropic funds for purposes they deem worthy if they get some type of public recognition for doing so. You could write letters to local business institutions and ask for a monetary amount for sponsorship, and in return, offer to set up a newspaper story that describes the trip, its intended purpose, and the fact that you were sponsored in part by their business. This gives them "free" positive press and demonstrates a commitment to the community. This type of arrangement could be made with several businesses.
If you are affiliated with a specific church, you could talk to the church head about arranging a congregational sponsorship. Some churches will give a set amount from a fund while others will take up a special offering to be given to the student in need. Still other churches might put together a congregational dinner (each family contributes a dish, for example) with a plate price or donation given.
Regardless of the paths taken to raise money for the trip, the effort is a worthwhile investment in your education future.