The idea to place ring bells on each table is a great one.
Guests will have service the time they want.
Everyone has had some sort of experience with customers complaining that they've waited too long, where's my drinks, how much longer on the food, etc. If the staff were to wear a low cost smartwatch of sorts and/or utilize their current smart band to alert them of wait times, would this help efficiency? For instance, a small sensor underneath a table that will connect when in a foot or so range with the staffs "watch" or a timer on it they can set themselves and will buzz them if they have not returned within 10 minutes, when drinks are ready, food ready, etc. Or is this asking to much of the staff? Thoughts.