In Japan, some restaurants (not the fancy ones, but family-friendly places) have a button on the table just for that. Push it, and a few seconds later a waitres

In Japan, some restaurants (not the fancy ones, but family-friendly places) have a button on the table just for that. Push it, and a few seconds later a waitress appears, just like in an airplane. If you have younger kids, you have to be careful to sit them away from the button.