GPs for five days at my home, how do I find exchangers?

Greetings all! We are using GPs for a visit to Canada. Although the family has my NW city listed as a preferred destination, they are not crossing the border because of the strained political relations.

I have five days open in Portland, Oregon in mid-September. There must be someone who would like to visit at that time - how to find them? What is the protocol?

Thank you for your attention to this matter 🙃