Whoa... I just got a call from my Mom. Yep: she's still around. And we got to talking about things...
Brought to mind the ol' Dinner Bell. In our home, this was a very old bronze bell, with a wooden handle and the traditional "clapper" thingy inside - so it would ring loud and long when you rang it!
Do you have kids playing in the yard along about dinner time? Maybe down the street, on skateboards, roller-skates, bicycles, and like that? Trust me: an old-fashioned Dinner Bell can reel 'em in quick!
Old technology, I know. Maybe what are we supposed to do now? Call them on their cell phones? GAAK!
But tried and true. Worked for me when I was a pup. And man... I could hear that bell from blocks away! Could it work for you?