I planted a lot of broccoli and cabbage this year. The cabbages, though slow, have formed nicely and I’ve had few problems with insects due to an abundance of spiders in the garden. The broccoli was planted in both raised and not raised beds. I have heavy clay soil, which I add to each year. It was a cool, wet, year over all, but we did have a couple hot weeks here and there, especially mid July. I planted seed instead of plants, though I guess plants would’ve been better here in North Central Illinois. Anyway, my broccoli bolted, we had some for salads but none for freezing. And I have Romanesco out there that never flowered, and is 5 1/2 feet tall with leaves as long as my arm! It looks healthy enough but no flower heads. Now that it’s cooler again, will it flower? Is there something I should do?
It is quite late in the growing season and your garden is most likely nearing it's end.
This certainly was a trying year in your garden. Gardening is usually different each year. Try to just learn from this years successes and misses and plan for next year.
You may want to do some amending to the clay soil to help with water drainage and overall soil conditions for next year.
Here are some links for you with more information.