Don’t get upset, get Upset, my August puzzle. ‘Ere we go…

Written in Feb ’22, it’s time to let this one out into the wild. Solution and explanations are in the following post. Scroll down for a browser-solvable version. (There are no “check” or “reveal” buttons, but you will get a confirmation message if you have fully filled in the grid correctly.) Or print off the standard or inksaver versions.