People get all bent out of shape at no gift parties. (Event though the party isn't about them at all, still people like to dictate things.) You can request no gifts, but people will bring them. The people that honor your request, will feel very awkward.
We went to a really fun party, that collected gifts for a local animal shelter. It was a dig themed party and they requested blankets, toys, and food. I loved it, but people still showed up with toys and no items for the animal shelter.
The fact is, people are self absorbed and do what they want. Many people don't care about what you request. The simply do what they are comfortable with or are used to. I would just have the party and accept the gifts. Donate what you don't want or need.