Galen...why fat arrows? As line-cutters? I've gone the other way, skinny arrows (but I'm not entirely sold).
The only NM 3D schedules I have at the moment are SCBA club's and "other" ... Charles Arviso sponsors the Spirit Canyon...I've got to email him to ask what else he knows on the Navajo...probably Krooked Arrow mid-summer at Narbona Pass.
http://scbaarchery.org/shoots/category/scba-shoots/ http://scbaarchery.org/shoots/category/other-shoots/
I'm sure somethings upcoming in Santa Fe but wasn't able to get details last time I tried...3Ds are open to public but the range is otherwise restricted to members ($$)
March 4 & 5 I plan to go to the two-day Buck Lewis outside Tucson AZ.. (airbnb.com (cheaper than motel..don't want to desert camp)
http://huachuca-archers.com/?event=2017-buck-lewis-and- southern-arizona-rendezvous