Hi, 

The chard symptoms look indicative of Spinach/beet leaf miner (see the tab under the heading). There are management tips on the page as well. Unfortunately those look rather severely damaged. Try to snip off the worse looking leaves and see if the new growth as the same issues. It is too late to use a row cover now since they will be trapped inside.

The other plants are showing Four-lined plant bug damage. It is common and doesn't overly harm the plants. They should move on or get eaten by predatory insects soon. 
https://extension.umd.edu/resource/plant-bugs-flowers/

Let us know if you have further questions. 

Emily