I booked off-site, most hotels off-site for next week seemed fine with regular rates, even starting Monday night, so the NAMM people seem to mostly clear out by Sunday when the convention ends.
GCH seems booked solid all week (which I still find a bit odd for off-season) while DLH seemed booked pretty tight early in the week.
I'm wondering if some NAMM people can use their corporate rates even after the convention is over and decided to stay a bit longer with family? Or maybe there is something specific happening at GCH, so spillover is filling up the other hotels.
The other thing is the Disney property rates seem pretty decent (relatively speaking) since it's off-season so maybe more people just decided to splurge and stay on-site.