I'm one of those northern gardeners - at just about 48 north latitude and a couple thousand feet in elevation. For me, timing is everything

when it comes to succession.
It isn't always - how many days-to-maturity is this variety rated? This is an arid climate and when the influence of the coast, 300 miles to the west, finally wanes - it gets hot and dry! The deeper sowing of larger seed is a good deal less problematic as the soil surface dries quickly and shallow-sown, small seeds can't get a start.
Others may be able to say that "this crop, follows that crop" but I pretty much just ask myself "what is coming out and what can germinate/grow right now?"
I fit summer squash between the early cabbage as it is being harvested. Bush beans can be planted right to mid-July without any real chance of failure and, they
can follow the peas - I've done it for years. Even tho' the sowing of peas was late/late this year, I've managed to harvest some bush beans since we haven't had an early frost this year. I even planted a teepee of pole beans in mid-July and harvested a hatful off the plants twice now.
I can plant snow peas at the end of July. They don't do quite as well as they do when spring sown but the vines will have pea pods to harvest right about now.
Leaf lettuce has been started in protected areas in the backyard and set out repeatedly this year. Handling the lettuce this way has meant that it has been available, every week this season. That's something new for me

! The plants go in wherever there is room for them, altho' afternoon shade is preferred from mid-summer on. The entire plant is harvested when they are ready. A lot of the latest transplants followed sweet onions and shallots harvested in July.
Bok choy is sown repeatedly thru the spring. Thinnings are transplanted wherever there is room. In August, the sowings of bok choy can begin again. I also grow other Asian greens and they perform just about as well. I have lately been harvesting bok choy for weeks again and will have some Tokyo Bekana and Komatsuma in just a few days. All, from August sowings - a lot of them, on the bed that grew early varieties of potatoes.
Let's see. . . that's about all I can think of. Oh yeah, there has been lots of radish again lately and the arugula is about ready

. Hardly a square foot of the garden was vacant at any time during the season. Your season is different from mine but, if you have a supply of seeds on hand, you should be able to replace crops one right after the other in a
somewhat 
similar fashion.
Steve