Can I advertise or promote my business, organization, or cause on Couchers.org?

NO!
It is a violation of the Community Guidelines to use the platform to advertise, promote, or advocate for a product, service, business, organization or cause. With that said, it is okay to mention your approval/disapproval of, interest in, or involvement with a business, organization, or cause, as long as that is not the primary purpose of your profile, message, or event.