The holes in the chard don't look like slug damage to me. Besides, slugs are not picky eaters and you'd be seeing holes in all those other plants, too. Slugs mainly eat starting at the edges of the leaves, not in the middle like that.
Take out a flashlight at night and look at the backs of the leaves. I'll bet you find some little greenish caterpillars. That's what I find when I get damage to my greens like that. Just pick them off by hand.
Be careful, on the carrots - those little wormy things might be butterfly caterpillars. There's at least one type of butterfly that lays eggs on carrot foliage. Also, carrots are biennials so you won't get seed heads on them this fall, I don't think. You'll have to leave some roots in the ground, mulch them and let them grow next spring to make flowers and seeds for next year. Meaning, of course you'll have to plant more seeds next spring for a crop next summer, but then if you just routinely leave a few each year, you'll have a continuous supply.
