Armorcon is hosted by the Northeast Military Modelers Association, a joint AMPS and IPMS club. This is the same bunch of guys who hosted AMPSEast for many many years. Their club name has just changed. Many AMPS chapters also have IPMS standing. There are several large IPMS shows where the host club ask the local AMPS group to oversee and adjudicate the AFV portion of the contest as well. Cross-pollination is a good thing!
If you're near CT, know that the 3rd weekend of every September will host this show. It's a standard with armor modelers in the northeast.