OK, so I am that GOAL committee member.
The GOAL rolling rally committee envisions a procession of perhaps 200 or more vehicles and recognizes the need for real-time communications within the convoy, along the route, and with our police escort detail.
Many ham radio operators have experience planning and providing communications for public events while training for civil emergencies, these events include the Boston Marathon, Pan Mass Challenge, and numerous smaller events. And as is the case with any sector of society some of those hams are also gun owners.
The committee would like to investigate the possibility of tapping into that pool of communications expertise and available equipment. I will be reaching out to individuals within the club I am involved with. If you are, or can suggest, an experienced individual please feel free to PM me.
I will also be placing a thread on this topic in the ham radio forum here on NES. We ask that you keep in mind that this is a public forum and judge the sensitivity of any information you post.
P.S.> The members of this committee are just regular contributing members of GOAL like you who showed up and said "How can I help." There will be more need for help on this committee and there will be committees for other events, please consider getting involved.