This sort of thing (game snub) happens to EVERY chapter EVERY year. Maybe they couldn't agree on a crew; maybe they both have a history with the chapter they selected and a specific crew there; maybe they were just not happy with the product they got from their "home" chapter this year.
My crew got "excellent" (in our own coach's survey) from the winning team and "good" from the losing team one week, and then the very next week, 3 members of our crew got "unacceptable" and the other 2 "average" from the losing coach. He called us out on 3 plays that, according to film, (I think) shows that we got the calls RIGHT. We all know these guys get a bug up their BUTT about something involving their won/loss record and not necessarily the ACTUAL quality of the officiating. I don't think we should create a problem for another chapter, but that's just my opinion.
If the chapter is going to take their displeasure out on the schools, do it next year by letting them know you will no longer work their schedule.