Early blight https://www.planetna...e/early-blight/
Next year you'll need to give the plants more space/air between them, but that won't necessarily stop the blight. Start a preventative spray when you transplant. It does help, but may only slow the disease.
When blight affects my garden, I immediately remove all leaves/branches on the plant. Unfortunately, the plant will probably be removed and put into the garbage, no composting of any tomatoes or peppers in my garden.