Walk-a-thons would be a good idea too, then an event would be open to people who use canes, walkers and wheelchairs. I think you would have to put something together yourself and this foundation would be a great place to donate the proceeds.
If you can put some money into it and take a personal loss, you could order bracelets or bumper stickers, that appeal for a cure for GBS/CIDP. You cannot use the blue/white tiles which are the foundation logo as part of design. And again, proceeds should go to GBS/CIDP Foundation. If this appeals to you, just search for web sites that make bracelets.