I think all of you on this site give great advice on so many issues and scenarios, I thought I'd ask you about this: I organized a river rafting trip for a group of friends from college. Three of my friends are going, plus my friend's girlfriend. I paid for the whole thing and they each wrote me checks to pay me back (except the girlfriend never paid me because she lives somewhere else and didn't have my address). Just a week away from the trip he tells me they broke up and that she won't be going. The company doesn't allow refunds so I have been trying to find someone to go but there is a big music festival in San Francisco this weekend and almost ALL of my friends are going to that. If I can't find someone (which at this point I won't), is he responsible for paying me the $60 his ex-girlfriend owed me?