Summer Planting?

Summer Planting?

I'm more than a little angry at our home owner's association's community garden coordniator. I applied for a plot 2 months ago, got the confirmation and general location a week later, so I started my seeds in those Jiffy Greenhouses with the little peat pellets. Since then, it's been HELL trying to get the plot that's mine marked off. They still haven't, despite me calling 2-3x per week for several weeks, and then every day last week because my poor little plants are still in their little greenhouse pellets! So I've decided to say FU to the HOA and plant the garden in my yard (even though "only flowers" are generally allowed). So my question to you, oh Gardeners, is if the plants (some spinach, lettuce, broccoli, peppers, and squash) are still green and alive looking (the squash are even flowering now), should I plant them even this late? Should I scrap/compost these (*cries*) and start new with later-harvested veggies? What, exactly, could I plant from seed this far into the late spring? I'm in Maryland, by the way. Thanks for any suggestions as to what to do with my hopefully-not-stunted already-started veggies, and recommendations for summer-planted veggies!
New Dining Area

New Dining Area

My first harvest!

My first harvest!

Help with id’s and some garden idea/tips!

Help with id’s and some garden idea/tips!

raised bed materials

raised bed materials

Newbie with a question

Newbie with a question

What’s growing in my pot?

What’s growing in my pot?