G.B.
Please come to XXX shooting range at XXam/pm and spend some time with XXX(hubby) shooting the breeze, and whatever else he can shoot...lol.
Hubby and I are going to eat at XXX afterwards and if you' like to hang out with us that'd be great! They are having a /breakfast/lunch/dinner special that day of XXX for only $XXX.
But I would truly just let it be casual and talk to the wives and not put it on the invitation. An invitation means it's on you in my mind. Just tell the wives, hey, if you guys want to, we are going over to XXX after the guys get done.