(buckets are to catch water off the roof which splashes down onto plants) 
Tomatoes look healthy thank God, though I have used some copper based insecticide as a preventative since lasts year's blight (late July), but the butternut squash has shown what i surmise is powdery mildew since it began to grown. So a couple days ago I sprayed a mixture of milk plus the copper on them.
Now for detectives, does anyone know what kind of (city planted) tree this is?
I collect rainwater to save the LL money on the water bill and so I cover them with some slightly porous pore Tyvek-type material they wrap mattresses in, and cover them when it is not sppsd to rain, but if any mosquitoes get in, a once second shot of Pam will prevent them from getting out so that they drown.
But look what can happen when you plant bird seed:
Sorry if I jumped the gun but I gotta go.
Your tree is a ‘Japanese Lilac Tree’ and many towns have them planted on their Main Drag. They are just lovely, are on the smaller side, don’t make a mess to clean up, and are usually blooming on the 4th of July, when towns are having parades and such. It isn’t a true lilac; it is related to the Olive tree. Likes full sun, and isn’t fussy about watering.
I’ve probably sold 1,000 of them in my career. Every late June/Early July people want them for their yards. ;)
https://www.thespruce.com/japanese-lilac-tree-care-and-growing-guide-4589076
The East Boston Urban Frou-Frou Tree?
Seriously though, ornamental trees that are not native can cause serious problems later on. In Florida, the Black Olive and Melaleuca were planted as ornamental trees along sidewalks, and developed into real pests. The Black Olive drops nasty berries on your car and ruins the paint job. The Melaleuca and Brazilian Pepper are so invasive that they have to strip the land down to the bedrock to get rid of it.
Whatever it is there on your sidewalk, it will not be a sapling forever, and could become very big, dropping greasy staining flowers on your car, ripping up the sidewalk with its roots, and probably sending its seeds into your yard.
This is what happens when politicians think they are horticulturists.
Great veggie garden, by the way! I remember the pics you posted last year.