Huge Group—Rate deals?

Has anyone heard of all inclusive offering group rates for groups of 30+? We would need at least 15 bedrooms, family friendly.

Husbands family does a weeklong vacation together every other year and prefer beach houses. But now that we need 15 bedrooms minimum, that is near impossible. We have been suggesting an all inclusive for a while now, but google searches really give no concrete info. So rather than requesting a bunch of quotes, I thought I’d see if anyone here has done this before. This isn’t a wedding or corporate event, and that’s what most websites point to. Thanks!